 Hear more from Def Leppard and similar artists now. Search for Def Leppard on iHeartRadio. All your favorite music. All your favorite stations. All free. Now, a year in rock spotlight. From 1977. In February of 77, 60s band leader Manfred Mann has a new band and scores a U.S. No. 1 hit with a cover of Bruce Springsteen's song, Blinded by the Light.