Clarence White was the guitarist that wowed a huge section of musicians in the day. Still referred to by many as "best ever". Was particularly known for his acoustic dread naught flat picking and inventing the b bender guitar along with Gene Parsons. Marty Stuart still owns the original b bender.
He wasn't with The Byrds yet at the time of that recording however, joining in a revamped Byrds with Gene Parsons, Skip Battin, and last original member Roger McGuinn much later.
Marty Stuart: The Story of Clarence White & The Parsons/White StringBender | Reverb Interview