A top secret recording session took place on Tuesday night involving a supergroup of sorts covering one of the most recognized songs in rock history: Led Zeppelin’s classic “Stairway to Heaven.” The players? Soul queen Mary J. Blige on vocals; guitar god Steve Vai and his pop protégé Orianthi on rhythm and lead guitars, respectively; Travis Barker on drums and American Idol judge Randy Jackson on bass, with producer Ron Fair (Christina Aguilera, Pussycat Dolls) handling piano, the arrangement and all-star recruitment. The track’s destination: Blige’s 10th studio album, due out later this year.