When comparing Gnome Music vs Mopidy, the Slant community recommends Mopidy for most people. In the question“What are the best audio players for UNIX-like systems?” Mopidy is ranked 33rd while Gnome Music is ranked 37th. The most important reason people chose Mopidy is:
Extensions permit the streaming of music from cloud services such as Spotify, SoundCloud, and Google Play Music.
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Pros
Pro Simple clean and minimal interface
Pro Open source
Pro UI design consistent with GNOME desktop environment
Gnome Music is GNOME's default music player. If you use GNOME Desktop Environment, you'll feel familiar with other GNOME Apps like this one.
Pro Stable
Pro System-wide music organizer
Gnome Music automatically seeks and organises your music files throughout your system using Tracker.
Pro Capable of streaming music from cloud services via extensions
Extensions permit the streaming of music from cloud services such as Spotify, SoundCloud, and Google Play Music.
Pro Many front-ends
MPD clients and HTTP extensions/clients can connect to your Mopidy server. Front-ends range from web front-ends, mobile applications, to even console clients.
Pro Available as a Docker file
Mopidly's Docker file can be found here allowing for quick setup.
Cons
Con Cannot change library folder
Con Too Simplistic
It works as a simple music player with a GNOME look, but it has very few features and almost no configuration options. Too bad.
Con Buggy
Gnome Music needs a tracker daemon running in the background and that thing never loads the music. It takes forever for a huge library to be loaded even if it was previously partially loaded.