AQ made "Happen Again" available on September 22, 2021. Happen Again is 2 minutes and 34 seconds long and may contain bad words that may be unsuitable for children. Because this song is the only song in Happen Again and no other songs are present in the album, we classify this track as a single. In terms of popularity, Happen Again is currently below average in popularity. Since there is more of a neutral sound being played, this makes the track somewhat danceable.

Happen Again テンポ

We consider the tempo marking of Happen Again by AQ to be Andante (at a walking pace) because the track has a tempo of 93 テンポ, a half-time of 46テンポ, and a double-time of 186 テンポ. Based on that, the speed of the song's tempo is slow. Activities such as, yoga or pilates, can go well with this song. The time signature for this track is 5/4.

Happen Again キー

D Major is the music key of this track. This also means that this song has a camelot key of 10B. So, the perfect camelot match for 10B would be either 10B or 11A. While, 11B can give you a low energy boost. For moderate energy boost, you would use 7B and a high energy boost can either be 12B or 5B. Though, if you want a low energy drop, you should looking for songs with either a camelot key of 10A or 9B will give you a low energy drop, 1B would be a moderate one, and 8B or 3B would be a high energy drop. Lastly, 7A allows you to change the mood.