Former Led Zeppelin performers Robert Plant, left, and guitarist Jimmy Page play during their concert in Istanbul in this March 5, 1998 file photo. Cadillac is hooking up with Led Zeppelin as part of a new marketing campaign designed to raise the profile of Cadillac's newest vehicles. Television commercials will feature the song "Rock and Roll'' by the British rock group, General Motors Corp. said Tuesday, Jan. 22, 2002. It's the first time Led Zeppelin has sold its music for commercial use, GM said. (AP Photo/Murad Sezer, File)