Roylets's ' "Sou Ka" was released on its scheduled release date, September 10, 2019. Sou Ka is 2 minutes and 16 seconds long and may contain bad words that may be unsuitable for children. Since Sou Ka only contains only one song in the album, we like to consider this song as a single. Sou Ka is below average in popularity right now. Even with the track produces more of a neutral energy, it is pretty danceable compared to others.

Sou Ka テンポ

With Sou Ka by Roylets having a テンポ of 88 with a half-time of 44 テンポ and a double-time of 176 テンポ, we would consider this track to have a Andante (at a walking pace) tempo marking. Because of this, we believe that the song has an overall slow tempo. Looking at the テンポ of this song, this song might go great with yoga or pilates. The time signature for this track is 4/4.

Sou Ka キー

This song has a musical key of D Major. Or for those who are familiar with the camelot wheel, this song has a camelot key of 10B. So, the perfect camelot match for 10B would be either 10B or 11A. While, 11B can give you a low energy boost. For moderate energy boost, you would use 7B and a high energy boost can either be 12B or 5B. Though, if you want a low energy drop, you should looking for songs with either a camelot key of 10A or 9B will give you a low energy drop, 1B would be a moderate one, and 8B or 3B would be a high energy drop. Lastly, 7A allows you to change the mood.