the.com/aria

A solo singer's moment to stop the plot and show off.

means A self-contained melody for a single voice, usually in an opera or oratorio, built for emotion and vocal display rather than moving the story forward.

from From Italian 'aria,' meaning 'air' or 'atmosphere' — the same word Italians use for the air you breathe. It drifted into music to mean a melodic 'tune' or 'manner,' and by the 1600s, as opera was being invented in Italy, it settled into its specific sense: the big solo set-piece carved out from the surrounding recitative (the sung dialogue that actually pushes the plot). So the word for the song once meant simply 'the air it's sung in.'

etymology
Italian for air, as in melody, not oxygen
opera role
recitative moves the story, aria freezes it for feeling
structure
classic da capo arias repeat the opening after a middle section
beyond opera
bach wrote arias for solo instruments, no voice needed
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