Anonymous 4 was an American female a cappella quartet, founded in 1986[1] and based in New York City.

Their main performance genre was medieval music, although later they also premiered works by recent composers such as John Tavener and Steve Reich.

[3] The CD 1865, which features songs from the Civil War with Bruce Molsky on guitar, fiddle, banjo, and vocals was their final recording.

[4] The original lineup included Johanna Maria Rose, Marsha Genensky, Susan Hellauer, and Ruth Cunningham.

Genensky grew up in California in the foothills of the Santa Monica Mountains; Hellauer was born and raised in the Bronx, New York; Cunningham was brought up in Millbrook, New York; Rose grew up in the village of Grand View-on-Hudson, New York; and Horner-Kwiatek is from Monkstown, County Antrim, in Northern Ireland (she won her Green Card in the Diversity Immigrant Visa program, commonly known as the "Green Card Lottery").