Delta Sleep's '21 Letters' came out on July 8, 2015. With this song being about 5 minutes long, at 5:20, "21 Letters" by Delta Sleep 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 are a total of 11 in the song's album "Twin Galaxies". In this album, this song's track order is #3. Furthermore, we believe that the track originated from France. Based on our statistics, 21 Letters's popularity is below average in popularity right now. In our opinion, the overall tone is not very danceable and projects negative sounds, such as being sad, depressed, or angry.

21 Letters テンポ

With 21 Letters by Delta Sleep having a テンポ of 146 with a half-time of 73 テンポ and a double-time of 292 テンポ, we would consider this track to have a Allegro (fast, quick, and bright) tempo marking. Because of this, we believe that the song has an overall fast tempo. Looking at the テンポ of this song, this song might go great with jogging or cycling. The time signature for this track is 3/4.

21 Letters キー

F Major is the music key of this track. Or for those who are familiar with the camelot wheel, 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.