prayforyouth, kai's ' "heart & soul" was released on its scheduled release date, February 28, 2024. For a fairly short song, this song is "heart & soul" is considered an explicit song with a duration of 1:43. The song is number 5 out of 6 in birthday mix vol. 1 by prayforyouth. The popularity of heart & soul is currently unknown right now. Since there is more of a neutral sound being played, this makes the track somewhat danceable.

heart & soul テンポ

The tempo marking of heart & soul by prayforyouth, kai is Prestissimo (even faster than presto), since this song has a tempo of 203 テンポ. The time signature for this track is 4/4.

heart & soul キー

This song has a musical key of D♭ Major. This also means that this song has a camelot key of 3B. So, the perfect camelot match for 3B would be either 3B or 4A. While, 4B can give you a low energy boost. For moderate energy boost, you would use 12B and a high energy boost can either be 5B or 10B. Though, if you want a low energy drop, you should looking for songs with either a camelot key of 3A or 2B will give you a low energy drop, 6B would be a moderate one, and 1B or 8B would be a high energy drop. Lastly, 12A allows you to change the mood.