Any song performed poorly (as per the example in Will Fly's initial post) but especially a performance designed solely to allow us plebs to bask in the glory of the performer's impressive vocal acrobatics, never mind the disservice it does to the song.
This seems mostly to occur in 'pop' music (however one defines that - and some of which I enjoy) where it seems to be a horrible mutation of Black Gospel styles. It works in the original but seems ill-conceived in adaptation.