Removal request for: Butt Rock
Doesn't seem to contribute anything substantial and is a rather subjective (and condescending) slang term.
Has been used to refer to hard rock, hair metal and post-grunge. Unnecessary since not even regular music genres are regarded as concepts, and using umbrella terms like this seem unwarranted.
Not to mention the definition given on the concept page is probably unique in its claims, as the term (to my understanding) doesn't actually describe lyrics or structure but rather alludes to a lack of creativity.
Oh, and we already have Rock Music.