易烊千璽's '38.7km' came out on December 16, 2020. With 38.7km being less than two minutes long, at 1:04, we are fairly confident that this song is not explicit and is safe for all ages. Based on the duration of this song, this song duration is much smaller than the average song duration. There is only one song in 後座劇場, so we believe that "38.7km" is a single. In terms of popularity, 38.7km 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.

38.7km テンポ

The tempo marking of 38.7km by 易烊千璽 is Andante (at a walking pace), since this song has a tempo of 103 テンポ. With that information, we can conclude that the song has a slow tempo. The time signature for this track is 5/4.

38.7km 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.