コウ made "4月18日" available on April 25, 2015. With 4月18日 being less than two minutes long, at 1:40, 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 忘却日記, so we believe that "4月18日" is a single. In terms of popularity, 4月18日 is currently not that popular. Since there is more of a neutral sound being played, this makes the track somewhat danceable.

4月18日 テンポ

The tempo marking of 4月18日 by コウ is Andante (at a walking pace), since this song has a tempo of 98 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.

4月18日 キー

F♯ Major is the music key of this track. This also means that this song has a camelot key of 2B. So, the perfect camelot match for 2B would be either 2B or 3A. While, 3B can give you a low energy boost. For moderate energy boost, you would use 11B and a high energy boost can either be 4B or 9B. Though, if you want a low energy drop, you should looking for songs with either a camelot key of 2A or 1B will give you a low energy drop, 5B would be a moderate one, and 12B or 7B would be a high energy drop. Lastly, 11A allows you to change the mood.