Dr. Sing is a friendly doctor with a musical bent on Sesame Street. The doctor debuted in a 1993 episode, helping Telly Monster with a broken arm, and re-appeared in subsequent episodes in the storyline. Dr. Sing puts Telly at ease, consistently humming or singing, often to the melody of Broadway tunes or TV theme songs. He is also a member of the Triangle Lovers Club.

Dr. Sing's full name, as listed on his Triangle Lover's certificate, is Brad Sing Jr.