A worked example from PlayableNotes · 13 October2026

Bach Invention No.1 BWV772

22 bars. A worked exercise for adult pianists practising their own two parts between lessons; no observed learning result is claimed.

Source edition

Printed input PDF · Mutopia edition40. Engraving by jeff covey. CC BY-SA3.0

What happened in the product

The two-page PDF was genuinely read. Independent comparison with the source found eight RH pitches in bar7 a diatonic third too low. They were corrected in the product before the practice link was created. All467 source-note events otherwise match.

Musical checks and deliberate changes

The music is not simplified. The practice example changes tempo, hand selection and a loop. Its link is a snapshot of corrected version2. The source’s final arpeggio sign is omitted in playable notation; final fermatas remain. Ornamental playback is the app’s interpretation.

The exported score uses90quarter-notes/minute; the page demo starts at60. The source engraving and this re-engraved derivative are supplied under CC BY-SA3.0; see the license link.

Playback

The interactive score uses PlayableNotes’ digital piano. Choose a hand, tempo and short loop to listen to the existing music. This page’s example starts at60; the shared link starts at the saved90tempo until changed. Recognition needs checking against the printed source. Listening controls do not assess technique or replace the practice plan agreed with a teacher.

Files and reproducibility

File hashes and method record. The PDF, MusicXML and MIDI downloads were exported from the saved product versions. Existing site examples were preserved.