Completely different medium. Covering a song doesn't take nearly asm uch to remake a film. And most of the time, they're done for different reasons. Most covers are done as a tribute to inspirations, some done to convey their emotions in someone else's words, and some just to redo something popular.
I disagree. I think most cover songs are done for commercial appeal, to update the song for new generations. Pop charts are littered with them. I think what you're saying is a cynical misconception that favours renditions in one medium but treats with disdain renditions in another.
