HeartMuLa-RL-oss-3B-20260123

🎵 Try HeartMuLa online — no GPU or setup needed: heartmula.com Make songs from lyrics, create covers and remixes, and edit any passage of a song in MuLa Studio. Free daily credits.

HeartMuLa-RL-oss-3B-20260123 is a version of the HeartMuLa-oss-3B music language model refined with reinforcement learning, for more precise control over styles and tags. It generates songs from lyrics and style tags, and is used together with HeartCodec-oss-20260123, which decodes its tokens into audio.

For the best overall lyrics controllability and music quality, the heartlib repository currently recommends HeartMuLa-oss-3B-happy-new-year.

Model Sources

• Github Repo: https://github.com/HeartMuLa/heartlib
• Paper: https://arxiv.org/abs/2601.10547
• Demo: https://heartmula.github.io/
• Website: https://heartmula.com

Get Started

See the heartlib repository for installation, checkpoint layout and inference.

Citation

If you find HeartMuLa useful, please cite:

@misc{yang2026heartmulafamilyopensourced,
      title={HeartMuLa: A Family of Open Sourced Music Foundation Models}, 
      author={Dongchao Yang and Yuxin Xie and Yuguo Yin and Zheyu Wang and Xiaoyu Yi and Gongxi Zhu and Xiaolong Weng and Zihan Xiong and Yingzhe Ma and Dading Cong and Jingliang Liu and Zihang Huang and Jinghan Ru and Rongjie Huang and Haoran Wan and Peixu Wang and Kuoxi Yu and Helin Wang and Liming Liang and Xianwei Zhuang and Yuanyuan Wang and Haohan Guo and Junjie Cao and Zeqian Ju and Songxiang Liu and Yuewen Cao and Heming Weng and Yuexian Zou},
      year={2026},
      eprint={2601.10547},
      archivePrefix={arXiv},
      primaryClass={cs.SD},
      url={https://arxiv.org/abs/2601.10547}, 
}

License

Apache 2.0