Cindy Yen's '21天' came out on August 28, 2020. With this song being around four minutes long, at 3:42, 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 21天, so we believe that this song is a single. Based on our statistics, 21天's popularity is not that popular right now. Although the overall vibe is very danceable, it does project more negative sounds.

21天 テンポ

The tempo marking of 21天 by Cindy Yen is Allegro (fast, quick, and bright), since this song has a tempo of 123 テンポ. With that information, we can conclude that the song has a fast tempo. This song can go great with walking. The time signature for this track is 4/4.

21天 キー

C Major is the music key of this track. 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.