Elaine & Joe Devola singing Side by Side in front of Dr Reston's office. George singing Most Beautiful Girl as he laments his breakup with Susan Ross. George singing Master of the House during his visit with Mr Benes.
Elaine sings "War, What is it Good For" in the limo with Mr. Testikoff.
George and Jerry sing "How do you Solve a Problem like Maria" and "Lemon Tree" while trying to decide on a warning for when Jerry's switching George's girlfriend's answering machine tape.
Newman sings "Three Times a Lady" just before he burst into flames in his mail truck.
Kramer sings "Mexican radio" while installing his peephole. Or maybe when installing his screen door, but definitely one of the two.
George sings "If I were a Rich Man" in the limo he and Jerry share with the Nazis.
Bette Midler sings "Rochelle Rochelle".
Kramer sings "You Are the Wind Beneath my Wings".
Mel Torme sings "When You're Smiling".
Elaine sings "Crazy" when the non-arm swinger walks by her office.
Miss Rhode Island sings "It's a Most Unusual Day". Horribly.
Jerry sings "Overture, Curtains, Lights", the Bugs Bunny theme, while waiting for the opera to start.
George Steinbrenner sings "Heartbreaker" while waiting for George in his office.
I guess that's all of the actual songs I can think of.
But there are a number of made-up songs that deserve mention, like Elaine's "Get Well, Get Well Soon" and "Yankee Bean". Kramer's "I Like to Stop and the Duty Free Shop" and "Jerry's Gonna Be a Cable Boy".
And don't forget the Beefarino jingle. :)
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