Wildly different meta data and needs for search. With classical music, it's a standard use case to search music composed by X. For most other genres, no one ever searches for a composer. On the other hand, there will hundreds of performances of the same piece, and listeners will want to scroll though them, instead of just seeing the 1-3 most famous renditions of a song. Or you want songs from a specific conductor or with a specific solist. All of this makes classical music very distinct, while search pattern for most other genres are kind of similar.