The real reason to own this two-disc set is not to get Ozzy's greatest hits, but to get the "basement" recordings of Black Sabbath doing "Black Sabbath," "War Pigs," "Fairies Wear Boots" and "Behind the Wall of Sleep," as well as a hilarious interview with the Ozzman himself from 1988 (e.g. "I didn't think [Sabbath] were that good a band. We were all f--- up on drugs and booze all the time.) If you're an Ozzy fan, you'll definitely have everything else on this--from "Goodbye to Romance" with Randy Rhoads to his last single with Zakk Wylde, "I Just Want You." There is one unreleased track from the "Ozzmosis" session, "Back on Earth," but it's cheesy and unremarkable. "--Adem Tepedelen"