M*A*S*H season 1 episode 14
Episode title: Love Story
Radar gets a Dear John recording from home. Hawkeye and Trapper try to set him up with a date, but fail. Radar is taken by a new nurse at the camp and she is into poetry and music, so they coach him. Margaret wants to stop the relationship, so Hawkeye and Trapper get between her and Frank until she relents. Radar's "Ahhhh, Bach!" and "That's highly significant," quotes win him the girl.