Drums (musical instruments); Electric musical instruments; Electronic apparatus for synthesising music (musical instrument); Electronic background music machines; Electronic keyboards (musical instruments); Electronic musical instruments; Electronic musical keyboards; Electronic musical synthesizers; Electronic synthesizers being musical instruments; Electronically operated computer controlled musical apparatus; Electronically operated musical apparatus; Electronically operated musical instruments; Keyboard instruments (musical); Keyboards for musical instruments; Music synthesizers; Musical instruments controlled by microprocessor; Musical synthesizers; Percussion musical instruments; Synthesizers (musical instruments); Synthetic music apparatus; Bass drums; Drumsticks; Robotic drums