retsu made "Hatsu" available on January 16, 2024. Hatsu is 2 minutes and 25 seconds long and may contain bad words that may be unsuitable for children. Because this song is the only song in Hatsu and no other songs are present in the album, we classify this track as a single. In terms of popularity, Hatsu is currently below average in popularity. Even with the track produces more of a neutral energy, it is pretty danceable compared to others.

Hatsu テンポ

We consider the tempo marking of Hatsu by retsu to be Moderato (at a moderate speed) because the track has a tempo of 110 テンポ, a half-time of 55テンポ, and a double-time of 220 テンポ. Based on that, the speed of the song's tempo is moderate. The time signature for this track is 1/4.

Hatsu 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.