PUBLIC-DOMAIN MUSIC SOURCES

Johann Friedrich Franz Burgmueller (1806-1874), 25 Etudes faciles, Op. 100.
Collection Litolff, nineteenth-century source. Mutopia editions typeset by
Bas Wassink, updated 2013-01-12. Each edition explicitly states Public Domain;
its typesetter also dedicated the typesetting to the public domain.

No. 1  La Candeur  — Mutopia-2013/01/12-202
https://www.mutopiaproject.org/cgibin/piece-info.cgi?id=202
No. 3  La Pastorale — Mutopia-2013/01/12-218
https://www.mutopiaproject.org/cgibin/piece-info.cgi?id=218
No. 9  La Chasse — Mutopia-2013/01/12-220
https://www.mutopiaproject.org/cgibin/piece-info.cgi?id=220
No. 10 Tendre Fleur — Mutopia-2013/01/12-221
https://www.mutopiaproject.org/cgibin/piece-info.cgi?id=221
No. 15 Ballade — Mutopia-2013/01/12-227
https://www.mutopiaproject.org/cgibin/piece-info.cgi?id=227

Permission: https://www.mutopiaproject.org/legal.html
Public-domain contribution declaration:
https://creativecommons.org/licenses/publicdomain/

Original PDF sheet music, LilyPond notation, MIDI notation and RDF permission
metadata are preserved here unchanged. mutopia-license.html archives the
publisher's permission explanation, fetched 2026-10-08.
The MIDI contains computer-readable notation, not a sampled piano recording.

CURRENT SOUNDTRACK

No. 15's 30-bar minor section remains the Morrdor 9 music. Its actual native
bass motif (C2 B1 C2 G1 A1 B1), chord stabs and breaks are the musical keystone
for four new explicitly written arcade themes: intro, Neptune, Haze and Lava
Tiger. A fifth written theme, Slipstreams / The Black Between, carries the
same rolling bass into a slower 3/8 liquid-travel loop, open-fifth harmonies,
chromatic-mediant detours and octave echoes. These are new melodies, harmonic routes and forms, rather than direct
piano transcriptions. NG+ uses The Black Undertow, a darker 112.5 BPM variation
with Phrygian inflections, driving bass, chord stabs and kick/snare percussion.
The normal slipstream theme now plays at 90 BPM, retaining its dreamy written
parts and sparse percussion; NG+ remains at 112.5 BPM. Their source motif
remains public domain.

The first two bosses retain the No. 9 La Chasse arrangement. Success/ending
retains No. 1 La Candeur. The former intro/Neptune/Haze arrangements have been
removed. No. 3 and No. 10 notation remains archived for provenance/history,
but is no longer part of the cartridge score.

Native arrangements lower registers, reduce chords to four pitched voices,
articulate note boundaries and add sparse percussion. Exact selections and
written forms appear in assets/audio-score.json and docs/audio.md. Source
adaptations and new written arcade music are distinguished in that manifest.

The source scores remain public domain. This provenance file is also included
in the HTML5 package as MUSIC-CREDITS.txt, alongside THIRD-PARTY.txt.