Well, I searched through docs, webpages and git issues, but I cannot find anything related to this so...
It should be interesting to GNOME Music to have more supported audio files, like WAV, FLAC, ...
Why? Because the app that reads these files atually are Totem. See #268
After research and tests, the app reads flac music files, but do not shows WAV files.
Note: EasyTag do not open WAV files either.
Sorry, but there is something about Fedora codecs?
Fedora 35 gnome-music 41.0 (dnf) easytag 2.4.3 (flatpak)
Multimedia rpm's installed:
mozilla-openh264 ffmpeg flac gstreamer1-libav gstreamer1-plugins-base* gstreamer1-plugins-good* gstreamer1-plugins-bad* gstreamer1-plugins-ugly* gstreamer1-plugin-openh264 gstreamer1-plugin-mpg123 mpg123-libs libmpg123 lame lame-libs