B. B. King (1925–2015) was a well-known blues guitarist and songwriter.
King made several appearances on Sesame Street, the first being in Episode 0130 where he recites the alphabet. He appeared again thirty years later, in Season 32, performing a song about the letter B with Bert, Benny Rabbit, Big Bird and Baby Bear.
He also appeared in "Yakety Yak - Take It Back", a recycling PSA that eventually aired on Sesame Street.