A synthesizer is an electronic instrument that creates sounds, often used to make music. It can imitate traditional instruments or produce completely new, artificial sounds.
The word is built from 'synthesis' plus the suffix '-er', meaning 'a thing that does'. It appeared in the 20th century when electronic music technology developed.
A synthesizer doesn’t just play notes, it actually builds the sound wave from scratch, like sculpting sound out of electricity. Many 'orchestra' sounds in modern pop and film music are actually carefully designed synth patches, not real violins or horns.
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