Robert Moog changed the course of music history in 1964 with the introduction of the first commercial Moog synthesizer. Unlike previous electronic instruments that were massive and difficult to use, Moog’s design utilized Voltage-Controlled Oscillators (VCOs) and filters. This allowed musicians to manipulate electronic signals to mimic traditional instruments or create entirely new, otherworldly sounds. A breakthrough came with the invention of the ADSR envelope (Attack, Decay, Sustain, Release), which allowed users to control how a sound starts, lingers, and fades, mirroring the physical properties of acoustic instruments. The synthesizer moved from a studio curiosity to a mainstream powerhouse after the success of Wendy Carlos’s album 'Switched-On Bach.' By the 1970s and 80s, synthesizers became the foundation of progressive rock, disco, and electronic dance music, eventually leading to the digital revolution in music production.