"12月15日" by THE FOREVER YOUNG was released on May 2, 2018. 12月15日 is about six minutes long, preciously at 5:44, making this song fairly long compared to other songs. There is only one song in 聖者の行進, so we believe that "12月15日" is a single. The popularity of 12月15日 is currently not that popular right now. In our opinion, the overall tone is not very danceable and projects negative sounds, such as being sad, depressed, or angry.
The tempo marking of 12月15日 by THE FOREVER YOUNG is Vivace (lively and fast), since this song has a tempo of 165 テンポ. With that information, we can conclude that the song has a fast tempo. The time signature for this track is 4/4.
This song has a musical key of D Major. 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.