Stringed instrument attachment for generating percussive sound

Disclosed herein are various embodiments of devices and systems which may be reversibly coupled to a sound hole of a hollow-bodied stringed instrument for the generation of percussive musical sounds. Various embodiments herein disclosed comprise various means of reversibly coupling a percussive attachment with a musical instrument, and comprise adjustable device body lengths and angular orientations relative to the hollow body of musical instruments so as to allow percussive sound-generating elements to produce musical sounds from within a resonating chamber of the hollow-bodied instrument through interaction with an inner surface thereof.