Its heart beat more than 400 times over nine years. Radio personality Robert Weston Smith -- better known by his on-air name, Wolfman Jack -- was its frequent, but not lone host. Singer Helen Reddy of "I Am Woman" fame also hosted several episodes. Most often, musicians of the day like Olivia Newton-John or Mac Davis, guest-hosted.
The show was such a success by the end of its first season it had spawned a rival, Don Kirshner's Rock Concert, down the dial at ABC.