Clock is a band featuring Def Leppard

Def Leppard

Def Leppard are an English rock band formed in 1977 in Sheffield as part of the New Wave of British Heavy Metal movement. Since 1992, the band have consisted of Joe Elliott , Rick Savage , Rick Allen , Phil Collen , and Vivian Campbell...

 guitarist Vivian Campbell

Vivian Campbell

Vivian Patrick Campbell is a Northern Irish rock guitarist who is a member of Def Leppard and was, from May 2010 to November 2011, a member of Thin Lizzy. Prior to joining Def Leppard in April 1992, he had been a member of Whitesnake, Sweet Savage, Trinity, Riverdogs, and Shadow King...

 and P.J. Smith, who sang backing vocals on Def Leppard's cover of the Sweet

Sweet (band)

Sweet was a British rock band that rose to worldwide fame in the 1970s as one of the most prominent glam rock acts, with the classic line-up of lead vocalist Brian Connolly, bass player Steve Priest, guitarist Andy Scott, and drummer Mick Tucker.Sweet was formed in 1968 and achieved their first...

 song "Action" on Def Leppard's Retro Active

Retro Active

Retro Active is an album by British hard rock band Def Leppard, released in 1993. The album features touched-up versions of B-sides and previously unreleased recordings from the band's recording sessions between 1984 and 1993...

album.

Clock's album, Through Time features the original version of "To Be Alive", which is featured on Def Leppard's Euphoria album.

Other members have included Mark Schulman

Mark Shulman

Mark Shulman was born April 2, 1962 in Rochester, New York. He is an American children's author of over 100 books. He is the founder of Oomf, Inc....

, Mark Browne, and Manny Alvarez.