The rocker is hoping to share some of his musical talents with the millions of residents who use one of the world's busiest transit systems each week.
In an interview with U.S. radio programme Sound Opinion, Murphy reveals he is keen to create distinct soundtracks for more than 400 underground stations in the New York City area, so commuters and tourists alike will be able to associate each place with a specific sound.
He explains, "I've been fighting for 14 years to get all the subway turnstiles to make music. I want to make every station in New York have a different set of dominant keys, so that people who grow up will later on in life hear a piece of music and say, 'Oh, that’s like Union Square.' It's such a brutal city. I think one little gift of kindness would be nice."
Murphy previously approached outgoing New York mayor Michael Bloomberg with the idea, but got nowhere. He is now hoping newly-inaugurated city leader Bill de Blasio will help him realise his symphonic subway dream.