D'yani made "Letter" available on June 6, 2021. With this song being around four minutes long, at 3:48, 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. Because this song is the only song in Letter and no other songs are present in the album, we classify this track as a single. Based on our statistics, Letter's popularity is below average in popularity right now. Since there is more of a neutral sound being played, this makes the track somewhat danceable.

Letter テンポ

We consider the tempo marking of Letter by D'yani to be Allegro (fast, quick, and bright) because the track has a tempo of 126 テンポ, a half-time of 63テンポ, and a double-time of 252 テンポ. Based on that, the speed of the song's tempo is fast. Activities such as, walking, can go well with this song. The time signature for this track is 5/4.

Letter キー

B Minor is the music key of this track. This also means that this song has a camelot key of 10A. So, the perfect camelot match for 10A would be either 10A or 9B. While, a low energy boost can consist of either 10B or 11A. For moderate energy boost, you would use 7A and a high energy boost can either be 12A or 5A. However, if you are looking for a low energy drop, finding a song with a camelot key of 9A would be a great choice. Where 1A would give you a moderate drop, and 8A or 3A would be a high energy drop. Lastly, 1B allows you to change the mood.