 The music format of both the weekly terrestrial radio show and the 24/7 satellite radio channel is based on Van Zandt's approach to rock 'n' roll history.Van Zandt believes that rock 'n' roll is a continuum from the early 1950s onwards and that it is artificial and counter-productive to segregate music by the decade it was created.So the Underground Garage presents music from every decade since the beginnings of rock 'n' roll in the early 1950s to the present day.