Premise: Nashville West was a short-lived American country rock quartet that was briefly together in the late 1960s. The group comprised multi-instrumentalist Gene Parsons, guitarist Clarence White, singer-guitarist-fiddler Gib Guilbeau and bassist Wayne Moore. Parsons and White left the band to join The Byrds while Guilbeau and Parsons later joined the Flying Burrito Brothers.
Hypothesis: Parsons and  White left Nashville West for The Byrds while Guilbeau and Parsons continued performing as Nashville West.