Now includes pianobarfly which can download the songs as they are played.
edit the two config files to change username and password:
pianobar/.config/pianobar/config
pianobar/.config/pianobarfly/config
the pianobar config has the directory where the m4a files are downloaded:
/mnt/us/music
mplayer can play the m4a files (included)
Good luck! Feedback is appreciated...
EDIT:
newest version of the file has no more system modifications, no bind mounts even.
EDIT2:
now has scripts from bugmenot that show an album cover and lyrics (if available).