Abstract: The sound box of a guitar is modified to add a concave shaped pocket that can be placed at various locations along the sound box body in order to be used to rest against the thigh of the instrumentalist while in the sitting position. An optional rubber gripping pad can be attached to the sound box rest pocket to add additional gripping power if desired. The sound box rest pocket can be applied to both electric and acoustic guitars and eliminates the need to wear guitar straps when playing in the sitting position. The sound box rest pocket does not negatively affect the quality of the sound produced from the guitar.