That definition of music is absolutely ridiculous. Are you suggesting that Ambient albums are not music either?
Regarding Pink Floyd, I've always found them very tame as far as progressive experimentation goes, personally, so I don't understand that criticism at all-- Unless we're talking about their less famous albums, like Ummagumma, they are very straightforward and clean when it comes to that stuff. I agree that I don't like how melodramatic, self-serious, and grandiose Roger Waters can get, but I think that has only negatively affected the band during The Wall, which I find massively overrated for that reason.
Regarding The Beatles, while I can understand thinking they're overrated if you're thinking along the lines of "pop music is limited and superficial and there are many other artists outside of the pop genre who are better", I can't make sense of anyone who doesn't think they're the greatest pure melodic/pop band of all time. So much so that I'm not even sure there's a distant second that I have in mind. I think that more than anything else, this is the reason why they're put on a higher pedestal than other greats-- because the domain that they've mastered is easily the most universally embraced genre world-wide. For me personally, I have an anti-pop/melody attitude, yet The Beatles are basically the sole exception for me. However, there are a few non-pop, less accessible, more eccentric bands who I think are better.
Regarding hip-hop, while it's obviously a credible form of music and art, and a lot of greatness comes out of it, I will say one unpopular thing along those lines-- I'm put off by this idea people seem to want to enforce that every genre is equally credible and that you're narrowminded if you don't think every genre has reached the same peaks as every other genre. While I love certain hip-hop albums, as a genre, I definitely don't think it has reached the same heights that some other genres have. There isn't a hip-hop artist who is nearly as good or better at creating music than Bob Dylan, for example, IMO. My two favorites are Eric B. and Rakim and Public Enemy, and I only have them in that fourth or fifth tier of all time greats, personally. That's not to say it can't happen in the future, though.