FWO has a highly entertaining challenge topic up: http://www.fantasy-writers.org
I have a full-blown idea, but held up by a) finding a title and b) the fact that I'm still deciding whether I want one POV character or two. Two is difficult to pull off in a short story, but especially for the romantic subplot, I feel as if I want the push-me-pull-you of having both their perspectives.
The special type of song I've selected is Puirt a beul. Puirt a beul aka "mouth music" is essentially turning a dance tune into a singing piece, often with nonsense vocables. If I am recalling correctly, this is another of these forms that came about because of the suppression of Scots / Irish culture - their instruments were taken away, so they sang their dances to remember them. I know one puirt in Scots Gaelic - it's not easy!
I'll get off my Celtic musician nerd stool now. I'm using a secondary world, so it won't be called Puirt a beul, but the concept will be a centerpiece.