Note to myself:

Create a file:
.is_audio_player at the root and insert:
audio_folders=MUSIC/,RECORD/
output_formats=audio/mp3

audio/mp3 can be replaced with OGG but most of my music is from Amazon so it is MP3 now and I want to avoid the hassle of converting. Should probably convert the whole lot though Banshee will convert on the fly so may not matter if I switch to OGG.