D.Y made "Fast" available on October 7, 2019. Fast is 2 minutes and 21 seconds long and may contain bad words that may be unsuitable for children. Because this song is the only song in Fast and no other songs are present in the album, we classify this track as a single. Fast is not that popular right now. Even with the track produces more of a neutral energy, it is pretty danceable compared to others.

Fast テンポ

The tempo marking of Fast by D.Y is Adagio (slowly with great expression), since this song has a tempo of 71 テンポ. With that information, we can conclude that the song has a slow tempo. The time signature for this track is 3/4.

Fast キー

D♭ Major is the music key of this track. This also means that this song has a camelot key of 3B. So, the perfect camelot match for 3B would be either 3B or 4A. While, 4B can give you a low energy boost. For moderate energy boost, you would use 12B and a high energy boost can either be 5B or 10B. Though, if you want a low energy drop, you should looking for songs with either a camelot key of 3A or 2B will give you a low energy drop, 6B would be a moderate one, and 1B or 8B would be a high energy drop. Lastly, 12A allows you to change the mood.