A musical composition for two voices or instruments, usually from Italian opera or classical music.
From Italian 'duetto,' derived from Latin 'duo' (two). It's the Italian musical term that was adopted into English, particularly in opera and classical music contexts.
The Italian term 'duetto' sounds fancier than just saying 'duet,' so composers and opera houses kept using it to make pieces sound more sophisticated—it's basically the musical equivalent of writing 'eau de toilette' instead of 'toilet water' on a perfume bottle!
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