Question: Who sings the only fools and horses theme?
Disambiguated questions and answers: question: Who sings the only Fools and Horses opening theme?
Who sings in the only Fools and Horses closing theme in the 1989 episode "The Jolly Boys' Outing"?
answer: John Sullivan
Chas & Dave
Natural Questions answer: John Sullivan (from the Wikipedia article "Only Fools and Horses")