I am a linux user and my music manager is GmusicBrowser. The reason I use this is that it's the only linux manager with labels. You can create a label like 'funky' or 'ballad' or 'acoustic' and then play songs based on the label.

I'm trying to find an android music player with similar functionality, where you can 'tag' a song not by editing the fields, but by associating it with a label. I also want a player with good smart playlists. Can anyone recommend a player?