In the 70s and 80s, some of the labels actually used to recycle vinyl--they called that "regrind" vinyl. And in some cases, a buyer might actually find a tiny piece of label embedded in the vinyl! The purer vinyl out there plays quieter and can also wear longer; they were calling it "virgin vinyl" back in those days since the public had been burned by the recycled stuff. I have to say for the A&M titles I've owned, they've all sounded really nice on that vinyl.