The concert wasn’t widely announced and the two performed for about 200 fans in a cellar-like setting called the Bowery Electric in Manhattan. The hour-long performance included songs from their 2013 album, “Foreverly,” a collection of songs inspired by “Songs Our Daddy Taught Us,” an album released by The Everly Brothers in 1958.

Armstrong played guitar and sang, while Jones switched between guitar and piano. The duo’s band also included drums, a standup bass and, at times, a violin and a harmonica.

Together, their voices made for a soothing performance far different than Armstrong’s rock performances with Green Day, which was recently inducted into the Rock and Roll Hall of Fame.

No other performances were announced.

Jones’ band, , is slated to open for Neil Young during a series of dates in July.