Abstract: A guitar tremolo control arm retainer is disclosed herein for releasably holding the arm in a selected position so that the basic tuning of the instrument is not altered during the playing of the instrument. The retainer is secured to the guitar and includes a U-shaped anchor member or yoke having a lateral opening for insertably receiving the tremolo arm. The anchor member is movably and resiliently carried on a support rod mounted on a bracket for vertical movement and a keeper is adjustably mounted on the bracket secured to the guitar for holding the anchor member in a selected position on the rod. Guide arrangement is provided between the anchor member and the bracket while a pliable insert occupies the opening of the member for yieldably bearing against the arm when inserted into the opening of the anchor member.