Rhythmbox
Used by 2 peoplewiki.gnome.org ↗
“I use Rhythmbox for my MP3 collection.”
Cory Doctorow Interview, Activist, writer, journalist · via Uses This 
“I listen to music (mostly in OGG Vorbis, although I have some old MP3s as well as some from the Amazon MP3 store) using Rhythmbox.”
Máirín Duffy Interview, UI designer, usability tester (Red Hat, Fedora) · via Uses This