Free Android Media Player with minimalistic interface. Based on BASS library.

FreeAmp can:

Very good sound quality
Smart organization of your library with sort by Artists - Folders & Albums - Years - Tracknumbers.
Custom mediascanner and tags reader
Don't guzzle battery
No more 100500 settings (it's just work)
Smart coverart finder
LockScreen Widget (4.2)
Play/Pause on headphones plug/unplug
Next track on volume up press (work if volume on max)
Mediabuttons on headphones (single press on play - play/pause double - next track)
Always free and opensource
Supported formats:

Ordinal formats (.mp3;.ogg;.oga;.wav;)
Free Lossless Audio Codec (.flac;)
AAC (.aac;.mp4;.m4a;.m4b;*.m4p;)
Monkey's Audio (.ape;)
MusePack (.mpc;)
Apple Lossless (.mp4;.m4a;.m4b;.m4p;)
Speex (*.wav;.oga;.ogg;)
Need more formats? Write me
May be added (.mp2;.mp1;.aif;.aiff;.aifc;.mo3;.xm;.mod;.s3m;.it;.mtm;.umx;.midi;.mid;.mus;.rmi;.kar;.wv;.wvc;.mpp;.mp+;.spx;)
Contribute:

It is an open source player and you're welcome to contribute.
https://github.com/recoilme/freemp