a stringed musical instrument is provided wherein each string has two critical points . a fulcrum tremolo is mounted on the instrument for varying the tension of the strings and the distance between the two critical points . the strings are attached to a plurality of intonation modules mounted on the fulcrum tremolo . each intonation module is adjustable so that the strings can be adjusted from an untensioned state to a proper playing pitch . a bearing assembly is also included to facilitate pivoting of the fulcrum tremolo .