Owens "Boomer" Castleman was a member of The Survivors, a pre-Monkees group that included Michael Nesmith, Bill Chadwick, Michael Martin Murphey, and John London. He later co-wrote one of The Monkees' standout songs, "What Am I Doing Hangin' 'Round?" with Murphey, as well as "Texas Morning," which appeared on Michael's third solo album Nevada Fighter. In 1967, Castleman joined The Lewis & Clarke Expedition with Murphey and London.
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