On March 3, 2009, Rock and Roll Hall of Famers U2 released No Line On The Horizon. The 11-track album is the 13th in the band's storied, 30-year career. The first single from the record is called "Get On Your Boots." Never known for being camera shy or afraid of attracting attention, the band spent the first week of the album's release doing a five-night residency on David Letterman's long-running late night talk show, Late Night With David Letterman.
While U2 became international superstars for their music, they have probably become just as well known because of the social activism of their lead singer, Bono. Bono was even nominated for a Nobel Peace Prize for his humanitarian efforts on behalf of the African continent.