In the episode "Nailed", Jimmy illegally films a commercial in front of an American flag at a public school. He avoids being arrested for trespassing by telling the school administrators he is filming a documentary about a singer that allegedly attended the school, even though the singer is British ("Yeah, and that's some great trivia, but he spent his formative years right here in Albuquerque"). Name this singer, who is best known for a 1979 #1 hit.
Rupert Holmes