How have we not talked about Star Trek here lately? I'm going to break the dry spell. Here's Spock sitting down at the piano in the third season episode "Requiem for Methuselah" and playing what he recognizes as a completely new Johannes Brahms waltz. (Viewers in the know realize that it was written by the immortal Mr. Flint, played by James Daly.) Kirk gets into the action by asking Mr. Flint's voluptuous ward Rayna (Louise Sorel) to dance. (Viewers in the know also realize that Rayna is actually not a woman after all, but...gasp!...an android!)
The faux Brahms waltz was written by Ivan Ditmars, longtime Hollywood musical director who might be best known as the musical director for Let's Make a Deal. His waltz is a delightful lilting composition that Star Trek fans will always remember fondly. A transcription of it was published in the long-ago Trek fanzine The Star Trek Songbook (yes, I have a copy!) and more recently was transcribed and is available on the Free-Scores sheet music website, thanks to Amanda!
So that's your Star Trek for the day! Carry on!