Ruby Chelsea made "Letter" available on November 9, 2019. The duration of Letter is about two minutes long, specifically at 2:34. 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. On top of that, Turks and Caicos Islands appears to be the country where this track was created. In terms of popularity, Letter is currently not that popular. The overall tone is very danceable, especially with its high energy, which produces more of a euphoric, cheerful, or happy vibe.

Letter テンポ

We consider the tempo marking of Letter by Ruby Chelsea to be Andante (at a walking pace) because the track has a tempo of 100 テンポ, a half-time of 50テンポ, and a double-time of 200 テンポ. Based on that, the speed of the song's tempo is slow. The time signature for this track is 4/4.

Letter キー

This song has a musical key of A♭ Major. This also means that this song has a camelot key of 4B. So, the perfect camelot match for 4B would be either 4B or 5A. While, 5B can give you a low energy boost. For moderate energy boost, you would use 1B and a high energy boost can either be 6B or 11B. Though, if you want a low energy drop, you should looking for songs with either a camelot key of 4A or 3B will give you a low energy drop, 7B would be a moderate one, and 2B or 9B would be a high energy drop. Lastly, 1A allows you to change the mood.