『ユイカ』 made "序章。" available on March 1, 2023. With this song being about 5 minutes long, at 4:33, "序章。" by 『ユイカ』 is fairly a long song compared to the average song length. This song does not have an "Explicit" tag, making it safe for all ages. There is only one song in 序章。, so we believe that this song is a single. In terms of popularity, 序章。 is currently unknown. The overall tone is very danceable, especially with its high energy, which produces more of a euphoric, cheerful, or happy vibe.

序章。 テンポ

The tempo marking of 序章。 by 『ユイカ』 is Andante (at a walking pace), since this song has a tempo of 108 テンポ. With that information, we can conclude that the song has a moderate tempo. The time signature for this track is 4/4.

序章。 キー

A♭ Major is the music key of this track. This also means that this song has a camelot key of 4B. So, the perfect camelot match for 4B would be either 4B or 5A. While, 5B can give you a low energy boost. For moderate energy boost, you would use 1B and a high energy boost can either be 6B or 11B. Though, if you want a low energy drop, you should looking for songs with either a camelot key of 4A or 3B will give you a low energy drop, 7B would be a moderate one, and 2B or 9B would be a high energy drop. Lastly, 1A allows you to change the mood.