| http://www.w3.org/ns/prov#value | - Green Day, the 24th group to become part of Hard Rock???s Signature Series T-shirt program, join music icons and legends, such as Elton John, Eric Clapton, Bruce Springsteen, Ozzy Osbourne and Shakira, who have helped to raise millions of dollars for a number of charitable causes worldwide. ???We are excited to be a part of the Signature Series program and proud to partner with Hard Rock for such
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