In 1937, aged 18, Greenberg joined the Socialist Workers Party of Max Shachtman, and worked as a lathe operator and party activist. He lost work-related draft deferment in 1944 and joined the U.S. Merchant Marine till 1949. By this time he had lost interest in formal politics.
Greenberg, although self-taught, had been conducting amateur choruses such as that of the International Ladies' Garment Workers Union, and by 1950 was known as a choral conductor. Greenberg founded New York Pro Musica in 1952, signing with Esoteric Records of Greenwich Village, and recorded the first of 28 LP albums over the next 14 years.
W. H. Auden wrote of him, in regard to his having successfully revived interest in medieval, renaissance and baroque music, "To devote one’s musical career, as Noah Greenberg did, to works outside (the standard concert) repertory, calls for faith and courage of the highest order."
He died at University Hospital, Manhattan, after an apparent heart attack, on January 8, 1966.
- New York Pro Musica: An Anthology of Their Greatest Works, Noah Greenberg, conductor. 7 record set. Everest Records (1966, Everest 3145/7)
- James Gollin, Pied Piper: The Many Lives of Noah Greenberg, Pendragon Press (2001), ISBN 1-57647-041-5
- Terry Teachout: Noah Greenberg's Revolution (October 2001)
- Noah Greenberg Is Dead at 46; Founded New York Pro Musica; Group Spurred a Revival of Pre-Classic Music — Mother Dies on Hearing News, New York Times, January 10, 1966 
- E Nowacki, Noah Greenberg and the New York Pro Musica
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