A worked example from PlayableNotes · 13 October 2026

Brahms Waltz Op.39 No.15

44 bars. The student scenario is illustrative; it is not a testimonial or an observed learning result.

Source edition

Printed input PDF · Mutopia edition 794. Engraving by Brian D. Rude. The source identifies this engraving as public domain.

What happened in the product

The complete two-page PDF was genuinely read. All 425 right-hand and 295 left-hand source notes matched the edition’s MIDI in pitch, onset and duration. A web AI request created a closer-position accompaniment on a copy.

Musical checks and deliberate changes

Every RH event is unchanged. The left-hand rhythm and the complete two-hand harmonic pitch-class sets are preserved. The largest consecutive movement of the lowest LH note falls 24→9 semitones; in bar 2 bass-to-next-chord lowest note falls 19→4 semitones. These measure register travel, not hand span. Some octave chords remain.

Both use a chosen 90 quarter-notes/minute practice setting; this is not a tempo attributed to the source.

Playback

The interactive score uses PlayableNotes’ digital piano at the same selected tempo for both versions. It is digital playback, not a student performance.

Actual submitted AI request and saved response · Full request as text. The checked study matches the saved web AI result; no manual note repairs were required on this example. Register and chord doublings change even though the combined sounding harmonic pitch classes are retained.

Recognition and arrangement need checking against the teacher’s source and musical aim. These complete examples demonstrate particular changes, not a promise that every input is read or arranged perfectly.

Files and reproducibility

File hashes and method record. The PDF, MusicXML and MIDI downloads were exported from the saved product versions. The study’s printed title was subsequently labeled “Waltz — closer-position study”; the new PDF and MusicXML preserve the same music. Existing site examples were preserved.