This app Rocks
... and Blueses, and metals and .....
Ok, excuse me for the poor joke...
Very nicely done, but you can still do something to make it more amazeing:
First of all pimp the graphics.
Secondly, it could be interesting to add "apps in the app". I'm thinkin of games.
A easy one could be the Music quiz, directly imported from iPod.
Another idea could be adding some rythm based games or, if there exists something like that, link to a "rythm games library" and let you use them within Music Quest.
Finally i'll expose a ilttle dream i always had about music browsing software:
A "note key" search criteria that lets you create random playlists (within a genre or totally random) matching sons endings and beginnings for theyr keynote.
This last one is sophisticated and, for as far i can imagine, it would need a lot of works on things i don't even think exist BUT, who knows, maybe you're more resourcefull than i think.
Again, good job!