Ei's '21' came out on April 23, 2024. The duration of 21 is about 3 minutes long, at 3:16. Based on our data, "21" appears to be safe for all ages and is not considered explicit. This track is about the average length of a typical track. There is only one song in 21, so we believe that this song is a single. 21 is 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.

21 テンポ

The tempo marking of 21 by Ei is Andante (at a walking pace), since this song has a tempo of 88 テンポ. With that information, we can conclude that the song has a slow tempo. This song can go great with yoga or pilates. The time signature for this track is 1/4.

21 キー

A Major is the music key of this track. This also means that this song has a camelot key of 11B. So, the perfect camelot match for 11B would be either 11B or 12A. While, 12B can give you a low energy boost. For moderate energy boost, you would use 8B and a high energy boost can either be 1B or 6B. Though, if you want a low energy drop, you should looking for songs with either a camelot key of 11A or 10B will give you a low energy drop, 2B would be a moderate one, and 9B or 4B would be a high energy drop. Lastly, 8A allows you to change the mood.