Alexander "Bobby" Kok (14 February 1926 – 1 May 2015) was a cellist, a successful session musician and a founder member of the Philharmonia Orchestra.Bobby Kok was perhaps best known for working with The Beatles on many of their songs; being a particular favourite of their producer George Martin.
He played cello on some of The Beatles' biggest hits, including "Hey Jude", and "Yesterday".The violinist Felix Kok was his brother.