1. Search on the Internet: The name was searched across various platforms like YouTube, Spotify, and music websites to find any snippets or explanations.

2. Music Databases: Databases such as Google Music and Apple Music were used to check if "Sing-box" is part of any albums, tracks, or collections.

3. Possible Source Identification: The possibility of "Sing-box" being from a movie, video game, or album was considered. Searches in these areas were conducted to find relevant sources.

4. Contextual Understanding: The idea of "Sing-box" being a remaster or a re-release was explored, considering it might be based on an older song or album.

5. Official Sources: The official website and any press releases were checked to confirm the title and its origin.

6. Further Exploration: If no initial information was found, the consideration was given to remaster versions, art book or graphic novel references, and the possibility of collaborations.

7. Seeking Help: If no further information was available, the approach was to reach out to music communities for additional insights.

After thorough exploration, the final conclusion was that "Sing-box" is likely a remastered version or re-release, possibly from an older song or album, and further verification would be needed to confirm its source.