KIRK: What’s that music you’re playing?
UHURA: It’s beautiful.
SPOCK: That was a simple scale. I was merely tuning the instrument.
MCCOY: But you can play tunes on the contraption?
SPOCK: I took second prize in the all-Vulcan music competition.
MCCOY: Second prize. Who took first prize, Spock?
SPOCK: My father.
KIRK: Can you play a love song?

Very important actual deleted scene from “Elaan of Troyius”