When Nonesuch Records celebrated its 50th anniversary in 2014, with festivals at London's Barbican Centre and New York's Brooklyn Academy of Music (BAM), Kronos Quartet joined forces with four labelmates – Sam Amidon, Olivia Chaney, Rhiannon Giddens and Natalie Merchant – to perform a concert entitled Folk Songs. The group later recorded the songs, most of which are traditional with contemporary arrangements