A tremolo system for a stringed musical instrument, comprising a tremolo arm member which extends outwardly from the instrument body and is rotatable about its longitudinal axis; a bridge member which engages with the instrument strings and is capable of pivoting about an axis so as to alter the tension of the instrument strings; and a mechanism for rotating the bridge member about an axis in response to manual rotation of the tremolo arm member, including a cam member which is connected to the tremolo arm member, and a cam follower member which is movable within the instrument body and which is suitably connected to the bridge member.