Who was the gentleman playing music in the park in Mary Poppins?

In "Mary Poppins," the gentleman playing music in the park is Bert, portrayed by Dick Van Dyke. He is a cheerful and charismatic chimney sweep who also serves as a jack-of-all-trades, including a street performer. Bert's character brings joy and whimsy to the film, and he shares a special bond with Mary Poppins and the Banks children. His lively spirit and musical talent contribute to the enchanting atmosphere of the story.