musia-music-production

name	musia-music-production
description	Use when generating, correcting, reviewing, documenting, publishing, or handing off original music in Musia, including idea-to-song, lyrics-to-song, melody/chord-controlled songs, ACE-Step/YuE/SoulX route selection, vocal quality checks, song review reports, Fun Lazying Art website publishing, per-vocal lyric sets, and LALACHAN song-first video handoffs.

Musia Music Production

Use this skill for original song creation and review. For strict same-song localization, also use musia-song-localization.

Default Repo

/home/lachlan/ProjectsLFS/Musia

Core Rule

Do not accept a generated song just because a WAV exists. A usable song needs:

• audible sung vocal;
• healthy levels;
• coherent tempo/chord analysis;
• saved lyrics and prompt;
• review report;
• human listening pass when the result matters.

Quality comes before same-melody control. If a same-score/same-F0 route makes the vocal, pronunciation, phrasing, or arrangement worse, label that render experimental and leave it out of the public/final path. Regenerate with the best full-song model instead, even if EN/JP/ZH end up as independent high-quality versions rather than one perfectly shared melody.

Planned lyrics are intent, not blind truth. After generation, use listening and ASR/STT evidence to decide what the render actually sang. If the rendered vocal differs from the planned lyric, document the mismatch and publish lyrics/timing that match the audio. If ASR only substitutes a nearby word and the planned lyric is phonetically close, grammatically stronger, and supported by listening, keep the planned lyric.

Before calling lyric correction complete, run a word-by-word planned-line coverage audit. Compare every planned/reference line against the corrected active vocal and mark it as kept, sound-close corrected, split, merged, omitted-not-audible, or translation-only. Mixed-language ASR can miss a whole English or Japanese line inside a timing gap between recognized segments, so inspect gaps manually and restore sound-supported planned lines with real timing. Do not record, publish, or package Shipinhao Music until every planned line is accounted for and companion EN/JA/ZH tracks translate the actual active line.

Avoid real singer imitation or voice cloning unless the user owns or has explicit consent.

Beautiful Song Standard

Before generating, write a compact producer brief with:

• emotional arc;
• short singable lyric lines;
• duration, language, key/BPM when known;
• arrangement and vocal direction;
• negative instructions such as no clipped endings, no buried vocal, and no real-singer imitation.

Prefer fewer stronger lines over dense poetry. For Chinese/Japanese, reduce pronunciation risk by using natural, short phrases and correcting after ASR/listening.

Do not cram words into the song just to preserve every detail. Use musical space: 留白, held vowels, rests, repeated hooks, and breath-friendly pauses. Some lines should be sparse and some can be fuller; the goal is a proper fit to the melody and emotion, not the fewest words and not the most words.

Before generating or accepting EN/JP/ZH lyrics, do an LLM lyric-quality pass when an API/model is available. Use OpenAI, DeepSeek, or a strong Codex/GPT-5.5 reasoning pass to check:

• rhythm fit: short singable phrases, line length, phrase stress, and likely breath points;
• musical space / 留白: whether a line should hold notes, leave rests, or repeat a simple hook instead of adding more words;
• rhyme / 押韵: English end rhyme or slant rhyme, Chinese rhyme groups, Japanese vowel/mora echoes;
• language-specific fit: English stress, Chinese tone comfort and natural wording, Japanese mora flow and particles;
• emotional clarity: the lyric should say something concrete and singable, not just be poetic filler.

Revise lyrics before generation if the LLM flags awkward rhythm, weak rhyme, overlong lines, or unnatural CJK wording.

Fast Workflow

Create a song package:

musia song init \
  --title "Song Title" \
  --idea "short concept" \
  --vocal-language ja \
  --lyrics-file lyrics.txt \
  --genre "cinematic J-pop" \
  --style "piano, warm strings, gentle drums" \
  --voice-notes "clear upfront young female vocal, no real singer imitation"

Generate:

data/creative_projects/<song-id>/commands.sh generate

Review:

data/creative_projects/<song-id>/commands.sh review

If the review shows quiet vocals, wrong language, clipped endings, or poor lyric recovery, do not publish as final. Run a correction pass or label it as experimental.

Correct:

musia song correct \
  --project-dir data/creative_projects/<song-id> \
  --issues "vocal unclear or endings clipped" \
  --caption-extra "clearer vocal, fewer words per line" \
  --lyrics-file corrected-lyrics.txt

Handoff to LALACHAN:

musia song handoff \
  --project-dir data/creative_projects/<song-id> \
  --audio data/creative_projects/<song-id>/final/selected.mp3 \
  --cover data/creative_projects/<song-id>/assets/cover-16x9.png

Reusable Script

Primary script:

scripts/musia_song_workbench.py

It supports:

init
review
correct
handoff
find-audio

Generated song folders are intentionally ignored by git:

data/creative_projects/<song-id>/

Model Routing

• Idea/lyrics to full song: ACE-Step 1.5 first.
• Vocal-only controlled short hook: SoulX if language metadata is supported.
• Strict source-song localization: Demucs/analysis plus YingMusic/SoulX prep, not full-song generation.
• Same melody is optional when it hurts quality. Prefer high-quality independent ACE/YuE language renders over low-quality same-score vocals.
• If Japanese/Chinese lyric accuracy is poor: shorten lines, reduce kanji ambiguity, increase vocal clarity in caption, try new seed/model, or use a specialized vocal workflow.
• For mixed EN/ZH/JP full-song demos on local open models, prefer one active mul sung/phonetic lyric track. If native CJK script collapses or garbles, use pinyin/romaji in the sung input and display native Chinese/Japanese as translations with pinyin/furigana. Document this as a phonetic render, not native-script singing.

Website Publishing Rule

For fun.lazying.art, use the musia-fun-website-item publication workflow before calling a website item finished. Use shared textTracks[] only when all playable vocals truly sing the same line structure. If English, Chinese, and Japanese renders are independent or imperfect, create per-vocal lyricSets[]:

lyrics/en-vocal/en.json
lyrics/en-vocal/zh-Hans.json
lyrics/en-vocal/ja.json
lyrics/zh-vocal/en.json
lyrics/zh-vocal/zh-Hans.json
lyrics/zh-vocal/ja.json
lyrics/ja-vocal/en.json
lyrics/ja-vocal/zh-Hans.json
lyrics/ja-vocal/ja.json

The active vocal owns timing and exact word highlighting. Other languages in the same set are translations of that vocal's actual sung lines and may rough-highlight corresponding tokens inside the same current line.id.

Correct every public lyric set from at least two evidence sources: ASR/STT from the actual vocal plus input/reference lyrics, second ASR, or manual listening. Add pinyin for Mandarin, furigana readings for Japanese kanji, and Jyutping readings for Cantonese. Run the publication audit:

musia fun-audit --media-id <media-id>

For EN/JP/ZH companion renders, double-check every visible translation track before publishing. ja.json should not silently contain English hooks, and zh-Hans.json / zh-Hant.json should not silently contain English hooks, unless the active vocal truly sang a mixed-language line and the manifest says so. Use musia fun-audit --media-id <media-id> --strict to catch wrong-script visible text.

The Fun player should keep public song playback clean: native-language dropdown labels, a two-line KTV lyric carousel, visible current-chord highlighting, and capture mode for videos. To record a share clip with the original audio muxed directly, run:

musia fun-record --media-id <media-id> --skip-intro

For a mixed-language vocal, use:

lyrics/mixed-vocal/mul.json
lyrics/mixed-vocal/en.json
lyrics/mixed-vocal/zh-Hans.json
lyrics/mixed-vocal/ja.json

References

Read only as needed:

references/musia-song-generation-and-website-runbook.md
references/fun-website-item-preparation.md
references/musia-song-workbench.md
references/lalachan-song-first-video-workflow.md
references/musia-full-capability-guide.md
references/musia-creative-studio.md
references/musia-website-json-format.md