M3 was an American experimental rock group, founded by the brothers Roger Miller, Ben Miller and Larry Miller. Their name is a dual reference to the three M surnames, and also pun on the musical notation for a minor third. All three Miller brothers are longtime fixtures on the Detroit/Ann Arbor, Michigan music scenes. M3 is a quasi-reunion of Sproton Layer, a short-lived group the Miller brothers formed in the late 1960s. Afterwards, Roger was active with several groups (notably Mission of Burma and Birdsongs of the Mesozoic), as were Ben and Larry (notably Destroy All Monsters).