roland d-50

synthesizer

nerd

keyboard (musical instrument)

hohner (business operation)

sequential circuits prophet-5 (consumer product)

sequential circuits (consumer company)

moog synthesizer (synthesizer)

synthesizers

yamaha dx21

roland d-50

roland jd-800 (synthesizer)

korg (musical instrument company)

yamaha dx7 (synthesizer)

roland corporation (musical instrument company)

synthesizer (musical instrument)