Kelly Yu made "時光的情書" available on September 17, 2019. With this song being around four minutes long, at 4:18, 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 電視劇《七月與安生》原聲帶, so we believe that "時光的情書" is a single. 時光的情書 is not that popular right now. Since there is more of a neutral sound being played, this makes the track somewhat danceable.

時光的情書 テンポ

The tempo marking of 時光的情書 by Kelly Yu 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.

時光的情書 キー

This song is in the music key of C Major. This also means that this song has a camelot key of 8B. So, the perfect camelot match for 8B would be either 8B or 9A. While, 9B can give you a low energy boost. For moderate energy boost, you would use 5B and a high energy boost can either be 10B or 3B. Though, if you want a low energy drop, you should looking for songs with either a camelot key of 8A or 7B will give you a low energy drop, 11B would be a moderate one, and 6B or 1B would be a high energy drop. Lastly, 5A allows you to change the mood.