Guest
John Hartman was an American drummer who was a co-founder and original drummer of the Doobie Brothers. At the band's inception, Hartman was the sole drummer. Hartman was the sole drummer. However, in late 1971, the group added second drummer Michael Hossack, and the dual-drummers formation remained until 2016 when Ed Toth became the band's sole drummer. (Hossack was replaced in 1973 by Keith Knudsen.)
