Moog Minimoog Model D

The Minimoog didn't invent the synthesizer, but it made it playable. Before 1970, synths were room-sized modular systems requiring a PhD-level understanding of voltage. Bob Moog put three oscillators, a legendary 24dB ladder filter, and a keyboard into a portable case. Stevie Wonder, Kraftwerk, Parliament, Herbie Hancock, and Gary Numan all built their sound on it. The filter alone — fat, warm, and unmistakable — is the single most imitated circuit in synthesizer history.