Watch how BACH turns raw tokens into structured music—step by step.

> "Via Score to Performance: Efficient Human-Controllable Long Song Generation with Bar-Level Symbolic Notation"
> ICASSP 2026 Submission – Pending Review

BACH is the first human-editable, bar-level symbolic song generator:
LLM writes lyrics → Transformer emits ABC score → off-the-shelf renderers give minutes-long, Suno-level music.
1 B params, minute-level inference, SOTA open-source.

User prompt Qwen3 — lyrics & style tags BACH-1B Decoder-Only Transformer ABC score (Dual-NTP + Chain-of-Score) ABC → MIDI → FluidSynth + VOCALOID Stereo mix

# 1. Clone
git clone https://github.com/your-github/BACH.git
cd BACH

# 2. Install
pip install -r requirements.txt        # transformers>=4.41 mido abcpy fluidsynth

# 3. Generate ABC
python bach/generate.py \
    --prompt "A rainy-day lo-fi hip-hop song about missing the last train" \
    --out_abc demo/rainy_lofi.abc

# 4. Render audio

example.mp3 is ready for you, it's a whole song. You can compare it with Suno🙂

• Complete training set (ABC + lyrics + structure labels)
• BACH-1B weights (Transformers format)
• Training scripts (multiphase + multitask + ICL)
• Complete Code

Paper is released on Arxiv,

@misc{wang2025scoreperformanceefficienthumancontrollable,
      title={Via Score to Performance: Efficient Human-Controllable Long Song Generation with Bar-Level Symbolic Notation}, 
      author={Tongxi Wang and Yang Yu and Qing Wang and Junlang Qian},
      year={2025},
      eprint={2508.01394},
      archivePrefix={arXiv},
      primaryClass={cs.SD},
      url={https://arxiv.org/abs/2508.01394}, 
}