The Gusli is an ancient Russian musical instrument, a kind of a harp.

There were two modifications of gusli:

Slemovidnye gusli (helmet-shaped gusli). The musician held this instrument on his knees, so that strings were horizontal, resonator body under them. He uses his left hand to mute unnecessary strings and thus forming chords, while passing all the strings with his right hand. The instrument was spread in southern and western regions of ancient Russia.

Krylovidnye gusli (wing-shaped gusli). This instrument was much smaller, had more resemblence with scandinavian harps, was held much more like modern guitars (although strings were still muted by the left hand through a special opening in the instrument's body). This modifications was more prelevant in northern parts of Russia, especially Novgorod and Pskov.