1. A FOOT-OPERABLE MUSICAL INSTRUMENT COMPRISING A PLURALITY OF TUNED STRINGS; STOP MEANS FOR VARYING THE EFFECTIVE LENGTHS OF SAID STRINGS SIMULTANEOUSLY IN PREDETERMINED RELATION; FOOT PEDAL MEANS OPERATIVELY CONNECTED TO SAID STOP MEANS FOR SELECTIVE OPERATION THEREOF WHEN SAID FOOT PEDAL MEANS IS MANIPULATED; A PLURALITY OF SEPARATE PLECTRUM ASSEMBLIES FOR SAID STRINGS MOVABLE RELATIVE TO SEPARATE OF SAID STRINGS INCLUDING A PLECTRUM FOR PLUCKING EACH OF SAID STRINGS, EACH OF SAID PLECTRUM ASSEMBLIES INCLUDING BY-PASS MEANS ADAPTED TO MOVE SAID PLECTRUM PAST ITS RESPECTIVE SAID STRING OUT OF ENGAGEMENT THEREWITH IN ONE DIRECTION OF MOVEMENT THEREOF AND PLECTRUM ASSEMBLY FOOT PEDAL MEANS OPERATIVELY CONNECTED TO SAID PLECTRUM ASSEMBLIES FOR SELECTIVE OPERATION THEREOF UPON MANIPULATION OF SAID FOOT PEDAL MEANS.