Music Under New York

Music Under New York (MUNY) is a part of the Arts & Design program by the Metropolitan Transportation Authority (MTA) that schedules musical performances in transportation hubs across its rapid transit, ferry, and commuter rail systems.
MTA grants every musician the legal right to perform, with or without MUNY affiliation. However, MUNY gives particular visibility and promotion to over 350 artists and groups who choose to participate. MUNY locations include approximately 30 high-traffic stations operated by the New York City Transit Authority that are part of the New York City Subway, the Long Island Rail Road, Metro-North Railroad, and the Staten Island Ferry. 
History.
Prohibition of musical performance in the New York City Subway was prevalent since the opening of the first line in 1904. The ban continued under Mayor Fiorello La Guardia, who also made it illegal to perform on New York City streets. Some musicians still sang and played instruments through the 1940s, 1950s and 1960s in an effort to reclaim public space. Finally in 1985, the ban on subway performance was declared unconstitutional following a court challenge by musician Roger Manning, and the MTA created MUNY as a pilot program. The program became official in January 1987.
MUNY had no impact on the legal status of subway performing, as MUNY performers are covered by the same rules governing the general public. However, affiliation with MUNY provides benefits to performers. These include priority scheduling in popular locations, access to commuter railroad terminals, and fewer problems with law enforcement. And, because the MUNY scheduling system rewards its auditioned performers with access to high-traffic areas, it arguably results in a higher-quality artistic product for MTA riders.
Legality.
It is legal to perform music in the New York City Subway with or without a MUNY affiliation. MUNY members as well as freelance performers are subject to regulations of the New York City Police Department and MTA. Section 1050.6 (c) of the New York City Transit Authority's Rules of Conduct regulates the provision of entertainment on the subway:
Notable performers.
Many of the musicians who perform in the subway under MUNY hold successful careers above ground as well. Saxophonist Zane Massey was involved early on in arranging big band performances with the organization in the 1980s and 1990s. A number of MUNY performers have gone on to perform at prestigious venues such as Carnegie Hall and Lincoln Center. These artists include Natalia Paruz (also known as the "Saw Lady"' for playing the musical saw), VongKu Pak (Korean drum), The Big Apple Boys (a cappella choir), James Graseck (violin), Hypnotic Brass Band, and Natalie Gelman (singer-songwriter). Possibly the best-known of them is Alice Tan Ridley, a gospel singer who was featured on season 5 of "America's Got Talent". The current MUNY lineup has artists such as the Ebony Hillbillies, SisterMonk, Didjworks, Manze Dayila, Renaissance Street Singers, Heth and Jed, Kesha, Yaz Band and the Ukuladies. Floyd Lee (1933–2020) was a founding member of MUNY and later a judge on their board. A full list of performers and locations can be found on the MUNY website.
A 2012 YouTube series known as "The Back Of The Busk" featured interviews with a number of MUNY performers, giving an insight into their background and careers.