I think there should be some source of Bionicle music (the new “rock” Bionicle music doesn’t count) out there. There is a project going on about Bionicle media, but I haven’t seen any music (the good old music from MNOG 1+2) yet. Lego was going to release an album in 2002/3, but that didn’t happen because the bands involved started squabbling among themselves and it fell apart. There is a cd somewhere that has 3 tracks on it (it came in the Bionicle Power Pack), but I haven’t found it anywhere for sale.

(Update) – Look at post Bionicle Music (#3) for info on how to get music from the Bionicle Powerpack)