AYESHA RASCOE, HOST:Joshua Wolk is a design engineer and amateur musician in New York City, with a love for jazz and datasets. RASCOE: He built trainjazz.com, which creates a jazz combo based on where every New York subway train is located at any given moment. (SOUNDBITE OF MUSIC)WOLK: So the website treats every line as a measure and the train's current position as a note along that measure. RASCOE: Wolk assigned each line its own instrument based on the history of jazz and trains in the city. WOLK: My rule for making Train Jazz was, is this something I could listen to for 3 hours straight without finding it super annoying?