> If you could copyright similar chord progressions then that would be the end of new pop music. And many other types of music. But whether you "can" or "can'

> If you could copyright similar chord progressions then that would be the end of new pop music. And many other types of music. But whether you "can" or "can't" copyright something doesn't really come in to play: I can sue anyone for anything, and as long as it's vaguely plausible so it won't get thrown out and my pockets are deep enough I can be a serious nuisance. Whether the claim is ridiculous or not is actually not all that important.