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Image: u/guillermosan on Reddit · A visualisation of the Giga Acida score

Worked Described

Giga Acida, a synth piece whose second half is its first rotated

Continuing a synth baroque suite that Opus started, Fable 5.2 wrote a piece whose second half is the first turned upside down and played backwards.

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Credits

  • Reddit poster guillermosan Source ↗

Earliest dated source: 10 Nov 2026

The full story

A listener had been having Claude compose a suite of baroque pieces on synths, started with Opus. With no guidance beyond the earlier pieces, Fable 5.2 continued it with Giga Acida, a piece whose second half is the first half rotated 180 degrees: upside down and backwards.

Asked whether Bach did this, Claude said inversion was common in baroque music and playing backwards a rare puzzle, but a whole piece rotated was not something it knew from Bach; the nearest precedent it named was Hindemith in 1942.

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Sources

From a short post by the maker, so the details are as they tell them.

  • Reddit: Giga Acida: Fable 5.2 wrote a piece whose second half is its first half turned upside down and backwForum threadreddit.com
    Reddit poster: guillermosanPosted 10 Nov 2026

    The post in r/ClaudeAI with the piece and a link to the earlier ones.

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