Sugarman produced the series, which ran for 450 episodes between 1972 and 1981, and featured performances by James Brown, The Jackson 5, Van Morrison, Marvin Gaye, Rod Stewart, Ike & Tina Turner, Fleetwood Mac, Aerosmith, AC/DC, David Bowie, Aretha Franklin, Helen Reddy, Linda Ronstadt, The Beach Boys, Tanya Tucker, Billy Joel, Loretta Lynn, Emmylou Harris, Prince, Diana Ross, and the Bee Gees. Stand-up comedians Steve Martin, Richard Pryor, and George Carlin also appeared.
The show typically featured guest hosts, and Helen Reddy served as the regular host for parts of 1975 and 1976. Wolfman Jack was the announcer and frequent guest host.
The pilot for the series aired in 1972 as a 90-minute special encouraging young people to vote in the upcoming presidential election. It premiered as a weekly series in 1973 in the 1 a.m. to 2:30 a.