Question: Name the American musician and singer-songwriter from New York state, who co-wrote "Where Everybody Knows Your Name" with Judy Hart Angelo and which went on to be the theme song for a 1980s television sitcom?
Sentence (from "Gary Portnoy"): Gary Portnoy (born June 8, 1956) is an American musician and singer-songwriter from the state of New York best known for co-writing and singing the theme song for "Cheers", "Where Everybody Knows Your Name".
Relevant evidence: Yes