- He later fronted both The Blue Shadows and The Co-Dependents.
- The Cowsills made regular television appearances. Columbia Pictures considered a television program based on their lives and starring most of the members of the band. This idea was eventually reworked and became The Partridge Family (1970), with David Cassidy playing the lead singer (Billy's position).
- The Cowsills had three Top 10 hits: "The Rain, the Park and Other Things", "Indian Lake" and "Hair".
- Formed the 1960s pop group, The Cowsills, with his brothers, Bob Cowsill, Barry Cowsill and John Cowsill. Their siblings, Paul Cowsill and Susan Cowsill, and mother, Barbara Cowsill, later joined the band.
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