deca joins's 'B1' came out on December 28, 2020. B1 is about six minutes long, preciously at 6:25, making this song fairly long compared to other songs. There is only one song in 鳥鳥鳥 Bird and Reflections, so we believe that "B1" is a single. Based on our statistics, B1's popularity is below average in popularity right now. Although the tone can be danceable to some, this track does projects more of a negative sound rather than a postive one.

B1 テンポ

The tempo marking of B1 by deca joins is Allegro (fast, quick, and bright), since this song has a tempo of 144 テンポ. With that information, we can conclude that the song has a fast tempo. This song can go great with jogging or cycling. The time signature for this track is 4/4.

B1 キー

F Major is the music key of this track. This also means that this song has a camelot key of 7B. So, the perfect camelot match for 7B would be either 7B or 8A. While, 8B can give you a low energy boost. For moderate energy boost, you would use 4B and a high energy boost can either be 9B or 2B. Though, if you want a low energy drop, you should looking for songs with either a camelot key of 7A or 6B will give you a low energy drop, 10B would be a moderate one, and 5B or 12B would be a high energy drop. Lastly, 4A allows you to change the mood.