Conversation so far:
When did Lester Young join the Count Basie Orchestra?
Lester Young was with Count Basie for the first time in 1934.
How long did Lester Young stay a member of the Count Basie Orchestra?
Lester Young was with Count Basie for the first time in 1934, back in 1936, leaving in 1940, rejoining in 1943, and a reunion at the 1957 Newport Jazz Festival.
When did Lester Young leave the Count Basie Orchestra band?
Lester Young was with Count Basie for the first time in 1934 but left to replace Coleman Hawkins in Fletcher Henderson's orchestra.
What instrument did Lester Young play?
Lester Young played tenor saxophone and clarinet.
What reed did Lester Young like to use?
While Lester Young never abandoned the cane reed, he used the plastic reed a significant share of the time from 1943 until the end of his life.
Did Lester Young have conflicts with the band?
By all accounts, Lester Young was a painfully shy and sensitive loner who hated conflict of any kind.

Question: Who is Billie?
Self-contained rewrite: Who is Billie for Lester Young?