I completely agree with Mudda on this too, and I don't understand anybody who doesn't. Yes, music is an art form, but it doesn't mean it isn't also a job for these people. Not every musician in the world is a gazzilionaire y'know. These people have spent countless hours writing, rehearsing, recording, playing and promoting this stuff, why shouldn't they own it forever? Never mind 50 years or even 95 years.
As a musician myself, I know that if I wrote a hit song I'd still want to be collecting the cheques 50 years from now, 95 years from now and basically untill I die. Even when I die I'd want that intelectual property right to be passed down to my kids, and for them to pass it down to there kids.
And nobody has 'betrayed a beautiful art for there own greed' the song still exists, it was still written, you can still listen to it and appreciate it. If anybody is gonna make moeny from it, why shouldn't it be the guy who wrote and popularised it? Why should it be anybody else?