The cover song. Often it’s a new band’s way to break onto the music scene by giving a fresh sound to a song that is already a proven hit. Limp Bizkit rocketed to fame by covering George Michael’s “Faith” with a metal’d-up mosh pit riot-inciting version. Newcomers Alien Ant Farm made a name for themselves with Michael Jackson’s “Smooth Criminal.” But what happens when an iconic singer whose voice and name are already world famous does not just a cover song, but a complete album of songs by other music icons? We get to find out on Ozzy Osbourne’s appropriately titled Under Cover album, which was given the DualDisc treatment by his record label Epic. Even if you love the Prince of Darkness with every ounce of your black soul, it’s hard to argue that he isn’t way past his singing ...