A keyboard (25) has keys (10) mounted to pivot about a vertical axis as well as about a horizontal axis. Movement of the keys (10) about tile vertical axis is detected to adjust the sounds provided by the musical instrument resulting from striking the keys (10). Wells may be provided with a substance that is selectively solid and fluid. An electronic string instrument emulator has an electromagnetic string and a bow with ferromagnetic material. A method for performing musical instruments includes adjusting the temperament of the instrument during performance based on the music being played. A keyboard instrument may be caused to sound using suitably arrayed electromagnets.