Bach entered music in 1962 as a guitarist, singer and comedian, before switching to bass in 1963. He then played as a back-up musician for Fred Neil, Tom Paxton, Bob Gibson and Josh White. In 1965, Bach and his friend Nigel Pickering made the acquaintance of Elaine "Spanky" McFarlane, a singer from Chicago. The three later became Spanky and Our Gang. The trio released their eponymous debut album in 1967.
He left the band prior to the release of their second album Like to Get to Know You in 1968. He then began to work as an arranger for Linda Ronstadt, Steve Miller and Sérgio Mendes. In the late sixties, Bach joined band such as Wings, Spooner Summit, Tarantula
After 1972, Bach started a talk show in Florida and directed an award-winning short film "Froggy Went A-Courtin'" (1977)
Bach died after a battle with cancer in September 1998. He was buried at the Blue Ridge Gardens of Memory Cemetery at Pisgah Forest, North Carolina. He was married four times and had seven children: Philip, Kelly, Kim, Jessica, Sarah, Belinda and Jonathan.