苏一's '观心自在' came out on July 1, 2016. 观心自在 is about six minutes long, preciously at 5:39, making this song fairly long compared to other songs. There is only one song in 观心自在, so we believe that "观心自在" is a single. In terms of popularity, 观心自在 is currently not that popular. Although the tone can be danceable to some, this track does projects more of a negative sound rather than a postive one.

观心自在 テンポ

The tempo marking of 观心自在 by 苏一 is Moderato (at a moderate speed), since this song has a tempo of 116 テンポ. With that information, we can conclude that the song has a moderate tempo. This song can go great with walking. The time signature for this track is 4/4.

观心自在 キー

D Major is the music key of this track. This also means that 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.