C21 was a Danish boy band consisting of three key members: Søren Bregendal (vocals, lyricist, producer and keyboards), Esben Duus (vocals, lyricist and guitar), and David Pepke (vocals, lyricist, guitar). History The band was formed in 1998 when Danish music producer Lars Quang heard Søren Bregendal singing in the locker room after his son's soccer game. Quang invited Søren Brengedal to his studio to test his vocals. Søren brought his fellow school friend, Esben Duus to the studio. At a warm up gig at a birthday party, the two met fellow musician David Pepke and the trio was formed. Studio releases C21 Their debut album C21 was the most successful Danish boy band debut album in Denmark. The first single Stuck in My Heart was released on September 16 2002 as the breakthrough single for the group and became popular in South-East Asia (namely Thailand). Further singles included You Are The One