biggest hits ever by a group of classic rock legends here is nbc's kevin tibbles. ♪ there's a lady whose sure all that glitters is gold ♪ >> reporter: for '70s rockers led zeppelin, all that glitters was gold with "stairway to heaven" but today the music was on trail did led zeppelin steal the opening rif from torres by randy wolf the estate of wolf better known in an interview before his d in 1997 california said listeners should make up their own mind it's an exact. i'd say it was a rip-off, and the guys made millions of bucks on it and never said thank you >> led zeppelin is famous for taking inspiration from other