Baroque flute sonata generated from four measures of Corelli

I gave Claude Opus 5.5 the same 4 measures of Corelli that I gave to Astra and told it to write a complete flute sonata. The results are just as good. As in the fugue I posted earlier today, I’m impressed by Opus’s ability to write compelling sequences; the one beginning at 3:26 is especially effective. I also enjoyed the chromatic bass line at 3:46, which I think Opus correctly referred to as a “lament bass” in its chain-of-thought, as well as the Phrygian cadence, which perfectly sets up the return to the tonic in the final movement. It’s amazing that LLMs now have this level of musical knowledge at their command.

— Auggie (@aug5thmusic) Sep 23, 2026