WMWM

Short-lived English group formed in Spring 1973 by Robert Wyatt, Dave MacRae, Gary Windo and Ron Mathewson (the band's name being the initials of its member), which played only a handful of gigs, of totally improvised music. For one concert in April 14th, 1973, Mathewson wasn't available and Richard Sinclair was asked to stand in for the bass player - this concert was still billed as WMWM, which is reflected in the crediting on bootlegs, but an official release in 2015 retroactively christened the resulting ensemble as WMWS.