Music Sage
Music Sage is a new search engine that focuses on music. Type in a band name like 'weezer' and Music Sage offers up results from all sorts of music related sources including the Wikipedia, album review sites, interviews, guitar tabs, lyrics, biographies and more. Interestingly, they seem to be using a passage retrieval algorithm to extract salient phrases from the sources to display in the search summary. All in all, the Music Sage results seem to me to be more relevant than a regular old google search.
MusicSage isn't just for searching for info about bands, other types of music searches work well too. Instruments, classical pieces, composers .. it's all there. (Well, almost all there ... it does have a bit of trouble finding info on the band 'the the').
Music Sage indexes all things musical. MusicSage has a nice clean design, not cluttered with ads or irrelevant info, all in all, its a nice clean implementation. Oh yeah, and it's from Oz.