diff --git a/src/covermanager/deezercoverprovider.cpp b/src/covermanager/deezercoverprovider.cpp
index 74b15dc82..bbf3291dc 100644
--- a/src/covermanager/deezercoverprovider.cpp
+++ b/src/covermanager/deezercoverprovider.cpp
@@ -142,7 +142,6 @@ QByteArray DeezerCoverProvider::GetReplyData(QNetworkReply *reply) {
             QJsonObject obj_error = value_error.toObject();
             int code = obj_error["code"].toInt();
             QString message = obj_error["message"].toString();
-            QString type = obj_error["type"].toString();
             error = QString("%1 (%2)").arg(message).arg(code);
           }
         }
@@ -178,7 +177,6 @@ QJsonValue DeezerCoverProvider::ExtractData(const QByteArray &data) {
     QJsonObject obj_error = value_error.toObject();
     const int code = obj_error["code"].toInt();
     QString message = obj_error["message"].toString();
-    QString type = obj_error["type"].toString();
     Error(QString("%1 (%2)").arg(message).arg(code));
     return QJsonValue();
   }
diff --git a/src/covermanager/qobuzcoverprovider.cpp b/src/covermanager/qobuzcoverprovider.cpp
index 12b353c25..3c1bd0204 100644
--- a/src/covermanager/qobuzcoverprovider.cpp
+++ b/src/covermanager/qobuzcoverprovider.cpp
@@ -140,7 +140,6 @@ QByteArray QobuzCoverProvider::GetReplyData(QNetworkReply *reply) {
       if (parse_error.error == QJsonParseError::NoError && !json_doc.isEmpty() && json_doc.isObject()) {
         QJsonObject json_obj = json_doc.object();
         if (!json_obj.isEmpty() && json_obj.contains("status") && json_obj.contains("code") && json_obj.contains("message")) {
-          QString status = json_obj["status"].toString();
           int code = json_obj["code"].toInt();
           QString message = json_obj["message"].toString();
           error = QString("%1 (%2)").arg(message).arg(code);
diff --git a/src/lyrics/geniuslyricsprovider.cpp b/src/lyrics/geniuslyricsprovider.cpp
index 0391a4865..25de1c3d3 100644
--- a/src/lyrics/geniuslyricsprovider.cpp
+++ b/src/lyrics/geniuslyricsprovider.cpp
@@ -173,7 +173,6 @@ void GeniusLyricsProvider::RequestAccessToken(const QUrl &url, const QUrl &redir
   if (url.hasQuery() && url_query.hasQueryItem("code") && url_query.hasQueryItem("state")) {
 
     QString code = url_query.queryItemValue("code");
-    QString state = url_query.queryItemValue("state");
 
     const ParamList params = ParamList() << Param("code", code)
                                          << Param("client_id", QByteArray::fromBase64(kClientIDB64))
@@ -241,7 +240,7 @@ void GeniusLyricsProvider::AccessTokenRequestFinished(QNetworkReply *reply) {
         if (!json_obj.isEmpty() && json_obj.contains("error") && json_obj.contains("error_description")) {
           QString error = json_obj["error"].toString();
           QString error_description = json_obj["error_description"].toString();
-          login_errors_ << QString("Authentication failure: %1 (%2)").arg(error).arg(error_description);
+          login_errors_ << QString("Authentication failure: %1 (%2)").arg(error, error_description);
         }
       }
       if (login_errors_.isEmpty()) {
diff --git a/src/playlistparsers/xspfparser.cpp b/src/playlistparsers/xspfparser.cpp
index 435fb53b8..61410d6a4 100644
--- a/src/playlistparsers/xspfparser.cpp
+++ b/src/playlistparsers/xspfparser.cpp
@@ -138,7 +138,6 @@ return_song:
 
 void XSPFParser::Save(const SongList &songs, QIODevice *device, const QDir &dir, Playlist::Path path_type) const {
 
-  QFileInfo file;
   QXmlStreamWriter writer(device);
   writer.setAutoFormatting(true);
   writer.setAutoFormattingIndent(2);
diff --git a/src/qobuz/qobuzbaserequest.cpp b/src/qobuz/qobuzbaserequest.cpp
index bc860a07d..f17376e6d 100644
--- a/src/qobuz/qobuzbaserequest.cpp
+++ b/src/qobuz/qobuzbaserequest.cpp
@@ -113,7 +113,6 @@ QByteArray QobuzBaseRequest::GetReplyData(QNetworkReply *reply) {
       if (parse_error.error == QJsonParseError::NoError && !json_doc.isEmpty() && json_doc.isObject()) {
         QJsonObject json_obj = json_doc.object();
         if (!json_obj.isEmpty() && json_obj.contains("status") && json_obj.contains("code") && json_obj.contains("message")) {
-          QString status = json_obj["status"].toString();
           int code = json_obj["code"].toInt();
           QString message = json_obj["message"].toString();
           error = QString("%1 (%2)").arg(message).arg(code);
diff --git a/src/qobuz/qobuzfavoriterequest.cpp b/src/qobuz/qobuzfavoriterequest.cpp
index cd5ec774b..6bfde69d4 100644
--- a/src/qobuz/qobuzfavoriterequest.cpp
+++ b/src/qobuz/qobuzfavoriterequest.cpp
@@ -146,7 +146,7 @@ void QobuzFavoriteRequest::AddFavoritesReply(QNetworkReply *reply, const Favorit
     return;
   }
 
-  QByteArray data = GetReplyData(reply);
+  GetReplyData(reply);
 
   if (reply->error() != QNetworkReply::NoError) {
     return;
@@ -248,7 +248,7 @@ void QobuzFavoriteRequest::RemoveFavoritesReply(QNetworkReply *reply, const Favo
     return;
   }
 
-  QByteArray data = GetReplyData(reply);
+  GetReplyData(reply);
   if (reply->error() != QNetworkReply::NoError) {
     return;
   }
diff --git a/src/qobuz/qobuzservice.cpp b/src/qobuz/qobuzservice.cpp
index 7700c7e2e..2bbe62ca3 100644
--- a/src/qobuz/qobuzservice.cpp
+++ b/src/qobuz/qobuzservice.cpp
@@ -170,7 +170,7 @@ QobuzService::QobuzService(Application *app, QObject *parent)
   QObject::connect(favorite_request_, &QobuzFavoriteRequest::AlbumsRemoved, albums_collection_backend_, &CollectionBackend::DeleteSongs);
   QObject::connect(favorite_request_, &QobuzFavoriteRequest::SongsRemoved, songs_collection_backend_, &CollectionBackend::DeleteSongs);
 
-  ReloadSettings();
+  QobuzService::ReloadSettings();
 
 }
 
@@ -317,7 +317,6 @@ void QobuzService::HandleAuthReply(QNetworkReply *reply) {
       if (json_error.error == QJsonParseError::NoError && !json_doc.isEmpty() && json_doc.isObject()) {
         QJsonObject json_obj = json_doc.object();
         if (!json_obj.isEmpty() && json_obj.contains("status") && json_obj.contains("code") && json_obj.contains("message")) {
-          QString status = json_obj["status"].toString();
           int code = json_obj["code"].toInt();
           QString message = json_obj["message"].toString();
           login_errors_ << QString("%1 (%2)").arg(message).arg(code);
diff --git a/src/scrobbler/listenbrainzscrobbler.cpp b/src/scrobbler/listenbrainzscrobbler.cpp
index f91212299..047e0815f 100644
--- a/src/scrobbler/listenbrainzscrobbler.cpp
+++ b/src/scrobbler/listenbrainzscrobbler.cpp
@@ -80,7 +80,7 @@ ListenBrainzScrobbler::ListenBrainzScrobbler(Application *app, QObject *parent)
   timer_submit_.setSingleShot(true);
   QObject::connect(&timer_submit_, &QTimer::timeout, this, &ListenBrainzScrobbler::Submit);
 
-  ReloadSettings();
+  ListenBrainzScrobbler::ReloadSettings();
   LoadSession();
 
 }
@@ -283,7 +283,6 @@ void ListenBrainzScrobbler::AuthenticateReplyFinished(QNetworkReply *reply) {
       if (json_error.error == QJsonParseError::NoError && !json_doc.isEmpty() && json_doc.isObject()) {
         QJsonObject json_obj = json_doc.object();
         if (json_obj.contains("error") && json_obj.contains("error_description")) {
-          QString error_code = json_obj["error"].toString();
           error = json_obj["error_description"].toString();
         }
       }
@@ -307,7 +306,6 @@ void ListenBrainzScrobbler::AuthenticateReplyFinished(QNetworkReply *reply) {
   }
   
   if (json_obj.contains("error") && json_obj.contains("error_description")) {
-    QString error = json_obj["error"].toString();
     QString failure_reason = json_obj["error_description"].toString();
     AuthError(failure_reason);
     return;
@@ -479,7 +477,6 @@ void ListenBrainzScrobbler::UpdateNowPlayingRequestFinished(QNetworkReply *reply
   }
 
   if (json_obj.contains("code") && json_obj.contains("error_description")) {
-    QString error_code = json_obj["code"].toString();
     QString error_desc = json_obj["error_description"].toString();
     Error(error_desc);
     return;
@@ -609,7 +606,6 @@ void ListenBrainzScrobbler::ScrobbleRequestFinished(QNetworkReply *reply, QList<
   }
 
   if (json_obj.contains("code") && json_obj.contains("error_description")) {
-    QString error_code = json_obj["code"].toString();
     QString error_desc = json_obj["error_description"].toString();
     Error(error_desc);
     cache_->ClearSent(list);
diff --git a/src/scrobbler/scrobblingapi20.cpp b/src/scrobbler/scrobblingapi20.cpp
index 61c9f3eb1..abd03e9b9 100644
--- a/src/scrobbler/scrobblingapi20.cpp
+++ b/src/scrobbler/scrobblingapi20.cpp
@@ -239,7 +239,7 @@ void ScrobblingAPI20::RequestSession(const QString &token) {
   session_url_query.addQueryItem("method", "auth.getSession");
   session_url_query.addQueryItem("token", token);
   QString data_to_sign;
-  for (QPair<QString, QString> param : session_url_query.queryItems()) {
+  for (const QPair<QString, QString> &param : session_url_query.queryItems()) {
     data_to_sign += param.first + param.second;
   }
   data_to_sign += kSecret;
@@ -764,14 +764,14 @@ void ScrobblingAPI20::ScrobbleRequestFinished(QNetworkReply *reply, QList<quint6
       continue;
     }
 
-    QString artist = obj_artist["#text"].toString();
-    QString album = obj_album["#text"].toString();
+    //QString artist = obj_artist["#text"].toString();
+    //QString album = obj_album["#text"].toString();
     QString song = obj_song["#text"].toString();
     bool ignoredmessage = obj_ignoredmessage["code"].toVariant().toBool();
     QString ignoredmessage_text = obj_ignoredmessage["#text"].toString();
 
     if (ignoredmessage) {
-      Error(QString("Scrobble for \"%1\" ignored: %2").arg(song).arg(ignoredmessage_text));
+      Error(QString("Scrobble for \"%1\" ignored: %2").arg(song, ignoredmessage_text));
     }
     else {
       qLog(Debug) << name_ << "Scrobble for" << song << "accepted";
@@ -917,8 +917,8 @@ void ScrobblingAPI20::SingleScrobbleRequestFinished(QNetworkReply *reply, quint6
     return;
   }
 
-  QString artist = json_obj_artist["#text"].toString();
-  QString album = json_obj_album["#text"].toString();
+  //QString artist = json_obj_artist["#text"].toString();
+  //QString album = json_obj_album["#text"].toString();
   QString song = json_obj_song["#text"].toString();
 
   int accepted = obj_attr["accepted"].toVariant().toInt();
@@ -1015,7 +1015,7 @@ void ScrobblingAPI20::Error(const QString &error, const QVariant &debug) {
   qLog(Error) << name_ << error;
   if (debug.isValid()) qLog(Debug) << debug;
 
-  if (app_->scrobbler()->ShowErrorDialog()) { emit ErrorMessage(tr("Scrobbler %1 error: %2").arg(name_).arg(error)); }
+  if (app_->scrobbler()->ShowErrorDialog()) { emit ErrorMessage(tr("Scrobbler %1 error: %2").arg(name_, error)); }
 
 }
 
diff --git a/src/tidal/tidalfavoriterequest.cpp b/src/tidal/tidalfavoriterequest.cpp
index 27ff52cdf..12d10c2ab 100644
--- a/src/tidal/tidalfavoriterequest.cpp
+++ b/src/tidal/tidalfavoriterequest.cpp
@@ -163,8 +163,7 @@ void TidalFavoriteRequest::AddFavoritesReply(QNetworkReply *reply, const Favorit
     return;
   }
 
-  QString error;
-  QByteArray data = GetReplyData(reply, false);
+  GetReplyData(reply, false);
 
   if (reply->error() != QNetworkReply::NoError) {
     return;
@@ -270,8 +269,7 @@ void TidalFavoriteRequest::RemoveFavoritesReply(QNetworkReply *reply, const Favo
     return;
   }
 
-  QString error;
-  QByteArray data = GetReplyData(reply, false);
+  GetReplyData(reply, false);
   if (reply->error() != QNetworkReply::NoError) {
     return;
   }
diff --git a/src/tidal/tidalrequest.cpp b/src/tidal/tidalrequest.cpp
index 36699159f..c5fc2ed09 100644
--- a/src/tidal/tidalrequest.cpp
+++ b/src/tidal/tidalrequest.cpp
@@ -671,8 +671,8 @@ void TidalRequest::AlbumsReceived(QNetworkReply *reply, const QString &artist_id
     }
     QString artist = obj_artist["name"].toString();
 
-    QString quality = obj_item["audioQuality"].toString();
-    QString copyright = obj_item["copyright"].toString();
+    //QString quality = obj_item["audioQuality"].toString();
+    //QString copyright = obj_item["copyright"].toString();
 
     //qLog(Debug) << "Tidal:" << artist << album << quality << copyright;
 
@@ -977,7 +977,7 @@ QString TidalRequest::ParseSong(Song &song, const QJsonObject &json_obj, const Q
   QJsonValue value_artist = json_obj["artist"];
   QJsonValue value_album = json_obj["album"];
   QJsonValue json_duration = json_obj["duration"];
-  QJsonArray array_artists = json_obj["artists"].toArray();
+  //QJsonArray array_artists = json_obj["artists"].toArray();
 
   QString song_id;
   if (json_obj["id"].isString()) {
@@ -988,7 +988,7 @@ QString TidalRequest::ParseSong(Song &song, const QJsonObject &json_obj, const Q
   }
 
   QString title = json_obj["title"].toString();
-  QString urlstr = json_obj["url"].toString();
+  //QString urlstr = json_obj["url"].toString();
   int track = json_obj["trackNumber"].toInt();
   int disc = json_obj["volumeNumber"].toInt();
   bool allow_streaming = json_obj["allowStreaming"].toBool();
@@ -1038,12 +1038,12 @@ QString TidalRequest::ParseSong(Song &song, const QJsonObject &json_obj, const Q
   QString cover = obj_album["cover"].toString();
 
   if (!allow_streaming) {
-    Warn(QString("Song %1 %2 %3 is not allowStreaming").arg(artist).arg(album).arg(title));
+    Warn(QString("Song %1 %2 %3 is not allowStreaming").arg(artist, album, title));
     return QString();
   }
 
   if (!stream_ready) {
-    Warn(QString("Song %1 %2 %3 is not streamReady").arg(artist).arg(album).arg(title));
+    Warn(QString("Song %1 %2 %3 is not streamReady").arg(artist, album, title));
     return QString();
   }
 
@@ -1062,7 +1062,7 @@ QString TidalRequest::ParseSong(Song &song, const QJsonObject &json_obj, const Q
   }
 
   cover = cover.replace("-", "/");
-  QUrl cover_url (QString("%1/images/%2/%3.jpg").arg(kResourcesUrl).arg(cover).arg(coversize_));
+  QUrl cover_url (QString("%1/images/%2/%3.jpg").arg(kResourcesUrl, cover, coversize_));
 
   title.remove(Song::kTitleRemoveMisc);
 
@@ -1188,7 +1188,7 @@ void TidalRequest::AlbumCoverReceived(QNetworkReply *reply, const QString &album
 
   QString mimetype = reply->header(QNetworkRequest::ContentTypeHeader).toString();
   if (!ImageUtils::SupportedImageMimeTypes().contains(mimetype, Qt::CaseInsensitive) && !ImageUtils::SupportedImageFormats().contains(mimetype, Qt::CaseInsensitive)) {
-    Error(QString("Unsupported mimetype for image reader %1 for %2").arg(mimetype).arg(url.toString()));
+    Error(QString("Unsupported mimetype for image reader %1 for %2").arg(mimetype, url.toString()));
     if (album_covers_requests_sent_.contains(album_id)) album_covers_requests_sent_.remove(album_id);
     AlbumCoverFinishCheck();
     return;