License Agreement for the IdolSongsJp Corpus

1. Permitted Uses

1.1 Non-commercial Research Use

You may use this corpus free of charge for non-commercial academic research purposes.

You must cite the following paper in any publication, presentation, or derivative work:

Hitoshi Suda, Junya Koguchi, Shunsuke Yoshida, Tomohiko Nakamura, Satoru Fukayama, and Jun Ogata, “IdolSongsJp Corpus: A multi-singer song corpus in the style of Japanese idol groups,” in Proceedings of the 26th International Society for Music Information Retrieval (ISMIR) Conference, September 2025.

Commercial research use, including incorporation into any commercial product or service, requires prior permission from the copyright holder.

1.2 Non-commercial or Limited Commercial Entertainment Use

You may use this corpus free of charge for non-commercial entertainment purposes.

You may also use it free of charge for limited commercial purposes such as light monetization via social media or video-sharing platforms or performance in live concerts, provided that the music content from this corpus is not the primary focus of the monetized content.

The following uses require prior permission from the copyright holder:

Distribution or sale of music derived from this corpus
Monetized content (e.g., videos on social media or video-sharing platforms) in which the music content from this corpus is the main feature

In all cases, you must include either a citation of the paper above or one of the following copyright notices:

2. Prohibited Uses

You are prohibited from the following.

2.1 Violations of Moral or Related Rights

Any use that infringes the moral rights of the original creators (such as modifications that may damage their honor or reputation) or the neighboring rights (such as rights of performers or producers) is strictly prohibited.

You may create derivative works such as arrangements, parodies, or altered lyrics, only if such works do not infringe upon these rights.

2.2 Unauthorized Machine Learning or Sampling of Instrumental Signals

You may not use instrumental signals (including master recordings and stem tracks) for following purposes.

Training machine learning models, including music generation models
Creating sample libraries
Any other content production not related to the original musical works

2.3 Misuse of Vocal Signals

Vocal signals in this corpus may be used for training machine learning models.

However, any use that results in the generation of offensive, defamatory, or otherwise inappropriate synthesized speech that may infringe the moral rights of the original vocalists is strictly prohibited.

2.4 Unethical, Political, Religious, or Criminal Use

Use of this corpus for any of the following purposes is prohibited:

Religious or political activities
Criminal activities
Unethical behavior, including harassment, defamation, or hate speech
Any use that violates public order and morality