n@di's ' "Letter" was released on its scheduled release date, January 23, 2022. The duration of This song is about two minutes long, specifically at 2:57. This song does not appear to have any foul language. Letter's duration is considered a little bit shorter than the average duration of a typical 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. The popularity of Letter is currently below average in popularity right now. The overall mood can be danceable to some, especially with it's high amount of postive energy.

Letter テンポ

We consider the tempo marking of Letter by n@di to be Prestissimo (even faster than presto) because the track has a tempo of 204 テンポ, a half-time of 102テンポ, and a double-time of 408 テンポ. The time signature for this track is 4/4.

Letter キー

This song has a musical key of G Major. This also means that this song has a camelot key of 9B. So, the perfect camelot match for 9B would be either 9B or 10A. While, 10B can give you a low energy boost. For moderate energy boost, you would use 6B and a high energy boost can either be 11B or 4B. Though, if you want a low energy drop, you should looking for songs with either a camelot key of 9A or 8B will give you a low energy drop, 12B would be a moderate one, and 7B or 2B would be a high energy drop. Lastly, 6A allows you to change the mood.