By the way, I agree that the same song can be sung by the same artist in multiple versions, especially if it is a "signature song" for the artist. Just Acoustic vs. Rock beat can totally be different, and they are both worthy of having in your music library and not wantonly purged because the metadata is the same.
My iPhone 5 was trying to process photos in the background last night and my Twitter app stopped responding to touches. The keyboard was lagging by 30-60 seconds.
Are you sure acoustic signatures will not be particularly onerous?
Pretty sure, yeah.
On the bright side, Apple does usually eventually fix or replace the hacky solutions. The other side of that is that it sometimes takes years.
If they checked acoustic signature wouldn't it still work with illegally downloaded music?