曹雪晶's '世界の約束' came out on November 25, 2004. With this song being around four minutes long, at 3:38, the duration of this song is pretty average compared to other songs. This track is safe for children and doesn't appear to contain any foul language, since the "Explicit" tag was not present in this track. There is only one song in 悠久的旋律「二胡」, so we believe that "世界の約束" is a single. 世界の約束 is unknown right now. In our opinion, the overall tone is not very danceable and projects negative sounds, such as being sad, depressed, or angry.

世界の約束 テンポ

The tempo marking of 世界の約束 by 曹雪晶 is Andante (at a walking pace), since this song has a tempo of 84 テンポ. With that information, we can conclude that the song has a slow tempo. The time signature for this track is 4/4.

世界の約束 キー

G Major is the music key of this track. This also means that this song has a camelot key of 9B. So, the perfect camelot match for 9B would be either 9B or 10A. While, 10B can give you a low energy boost. For moderate energy boost, you would use 6B and a high energy boost can either be 11B or 4B. Though, if you want a low energy drop, you should looking for songs with either a camelot key of 9A or 8B will give you a low energy drop, 12B would be a moderate one, and 7B or 2B would be a high energy drop. Lastly, 6A allows you to change the mood.