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 "Where Everybody Knows Your Name"): The song was written by Gary Portnoy and Judy Hart Angelo, Julian Williams and performed by Gary Portnoy.
Relevant evidence: Yes