Abstract: A simulated violoncello having an elongated body shaped in conformity with the fingerboard of a violoncello and a pair of curved panels adapted for confinement between the knees of the user and attached to the body to simulate the knee-held side portions of the resonance box of a violoncello is disclosed. The panels may be attached to a block which slidably engages a rail of trapezoidal cross-section formed along the back of said body and extending along a lower portion of the length thereof, whereby the height of said panels can be adjusted. An elongated floor support arm is attached to a lower end of the block which is removable and reversably disposable upon the rail so as to place the floor support arm in a stored position behind and adjacent the body of the instrument.