9Bach is an alternative folk group formed by Welsh singer-songwriter and pianist Lisa Jên and guitarist Martin Hoyland, a veteran of 1990s alt-rock band Pusherman. The group now includes Ali Byworth (drums and percussion), Dan Swain (bass guitar), Esyllt Glyn Jones (harp, vocals), and Mirain Roberts (vocals). The sextet's name puns on "nain", the word for "grandmother" in north Wales; "bach" means "small" in Welsh.