Simple, fast and lightweight
Handles libraries with tens of thousands of songs effortlessly, with much lower memory usage than behemoths like iTunes. GPU accelerated UI, too.
Free and open source
All good things are free, and in this case we mean free as in speech. Bugfixes, pull requests and other development welcome.
Supports many formats
Got a lot of songs in FLAC, Ogg Vorbis, MP3, AAC or Apple Lossless? All no problem, unlike iTunes.