original_query: Who is Billy Sherwood and what was his role in Yes?
query: Who is Billy Sherwood and what was his role in Yes?
answer: Billy Sherwood is a musician who became a longtime collaborator with Yes. He was a touring member in 1994, a producer/engineer from 1995-1997, and a full member (on guitar, keyboards and backing vocals) from 1997-1999.  After Chris Squire's death in 2015, Sherwood rejoined Yes to replace him on bass guitar.