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"): Shortly after the premiere of "Cheers", Portnoy went back into the studio to record a version of the song that made the US and British pop charts.
Relevant evidence: No