For music, Wiki is indispensable* when it comes to chart placement of a song, what band the lead singer previously belonged to, when she was born, and so forth, but for anything having to do with what the music is like or why anyone would ever care, Wiki is beyond worthless.

But...but...that isn't Wiki's job! That's the job of reviews, and forums, and fan sites, and MySpaces! Why anyone would (a) look to Wiki for that sort of information, or (b) want to be able to is beyond me. Wikipedia is not built to handle the discussions and mythologies and friendships and interactions that are encompassed by the phrase "why anyone would ever care."