NYC Subway’s Rhythms Transformed into Interactive Jazz Composition by Train Jazz

New York City’s subway is a symphony of motion—trains rumbling, brakes squealing, and crowds shuffling—but for designer Joshua Wolk, it’s also a source of jazz. His project, Train Jazz, transforms the rhythm of the Metropolitan Transportation Authority (MTA) subway system into an interactive musical experience.

Wolk launched Train Jazz after discovering NYC’s open transit data repository. He initially built a soundless live map of the city’s subway system but found it lacking. “It felt unfinished. I soon realized that music was that missing piece,” he told Fast Company.

How Train Jazz Works

The website visualizes MTA subway lines in real time, assigning a unique instrument to each line. Users see a simplified map where active trains trigger musical notes based on their positions along their routes. Hovering over a line’s symbol reveals details like the number of trains running, the line’s history, and its assigned instrument.

Instruments and Sounds by Line

Wolk’s research shaped each line’s sound. For example:

• F Line: 51 trains run citywide, producing a wobbly, unreliable sound—reflecting the line’s infamous delays. “The F is famously unreliable—its sound wobbles like a player who can’t hold a pitch.”
• Z Line: Plays soft maracas only during rush hour, with half the volume of its counterpart, the J Line, which runs all day.
• J Line: Produces a steady, continuous tone, contrasting with the Z’s intermittent rhythm.

The harmony evolves as trains move: rush hour fills the composition with held tones, while late-night silences stretch longer. “Whatever is playing now has not played before and will not play again,” the site explains.

Real-Time Updates and Location-Based Sound

The map refreshes every 15 seconds, pulling train coordinates from the MTA’s API. Trains near the user’s location grow louder, creating an immersive experience. “You are listening to a portrait of where you stand, played by the city you are standing in,” the site notes.

From Noise to Jazz

Though the sounds can be discordant, Wolk’s careful composition ensures a free-form, jazz-like beauty. “My rule was that Train Jazz wasn’t complete until it was something I could listen to for three hours straight,” he said. “That required putting a lot of care into how the notes float through the chord progressions.”

Future Plans: Bringing Train Jazz to the Real World

While Train Jazz exists as a digital experience, Wolk has bigger ambitions. “The internet is cool, but my dream is to give