Joshua Wolk, a design engineer at Vercel, built a website called Train Jazz — tagline: "Every train, a note." It pulls New York's real-time subway feed from the MTA, refreshed every fifteen seconds or so, and normalizes each line into a fixed-length lap. Wherever a train currently sits on that lap, a note sounds. Each line gets its own instrument, a dozen-odd lines run at once, and the site is always producing a jazz combo that never stops. Nothing here is composed in advance and then dressed up as a visualization — the music simply is where the trains currently are, and nothing else.

Wolk has described the project's origin plainly: "It felt unfinished. I soon realized that music was that missing piece." His own bar for calling it done is stranger than "sounds good" — not a satisfying climax but duration: "Train Jazz wasn't complete until it was something I could listen to for three hours straight." That's close to an admission that what he wanted was never a fixed piece, but a process he could keep living inside.

The MTA's real-time feed is itself a thoroughly finished construct — a GTFS-format transit schedule, a signaling system, a dispatch logic, all precisely engineered and named down to the second. What Wolk does to that construct is a chisel-cut: he strips away almost every layer of meaning the feed carries — no station announcements, no delay alerts, none of the official-notice tone a route name comes wrapped in — down to the thinnest possible remainder: what fraction of its lap a given train currently occupies. That remainder carries no explanatory content of its own; everything a ready-made vocabulary could name has been chiseled off, leaving only position — and it's precisely that emptied-out position he wires back into instruments, turning it into pitch and rhythm. It's a clean instance of the chisel-construct cycle: start from a system that is already fully named and fully closed (transit dispatch), cut away everything already named, keep the sliver no existing vocabulary covers (a train's instantaneous position on its route), and use that sliver to drive a new construct that hasn't yet set into a fixed shape — a live jazz ensemble.

Two reasons to look at it now. First, structurally, this band cannot be written down as a finished work: it has no score. Every performance is decided by whichever trains are actually running at that moment — delays, weekend reroutes, signal problems all rewrite the harmony directly. What you hear today will not repeat tomorrow, and never existed before today. Second, it's sitting right at the threshold of being named: it just made the shortlist for the 2026 Tiny Awards, a prize for "the small, poetic, creative, handmade web" judged by internet-culture observers like Andy Baio and Annie Rauwerda rather than gallery curators, with public voting closing September 25 — tomorrow. Whichever way the vote goes, once it settles, the piece will likely get folded into "best small websites of the year" lists and become a story that can be retold in summary. Right now it hasn't been folded into any list's language yet; it's still a band that is playing, with no one yet handing down a final verdict.

Listen to it now, if you're going to — the minute you hear will only ever exist that once.

Han Qin (秦汉) · @hqinjarsy · SAE Judgment & Aesthetics