suyin, kid sora made "hearts" available on December 24, 2020. For a fairly short song, this song is "hearts" is considered an explicit song with a duration of 1:19. Because this song is the only song in hearts and no other songs are present in the album, we classify this track as a single. The popularity of hearts is currently not that popular right now. Since there is more of a neutral sound being played, this makes the track somewhat danceable.

hearts テンポ

We consider the tempo marking of hearts by suyin, kid sora to be Vivace (lively and fast) because the track has a tempo of 170 テンポ, a half-time of 85テンポ, and a double-time of 340 テンポ. Based on that, the speed of the song's tempo is fast. The time signature for this track is 4/4.

hearts キー

This song has a musical key of A Major. This also means that this song has a camelot key of 11B. So, the perfect camelot match for 11B would be either 11B or 12A. While, 12B can give you a low energy boost. For moderate energy boost, you would use 8B and a high energy boost can either be 1B or 6B. Though, if you want a low energy drop, you should looking for songs with either a camelot key of 11A or 10B will give you a low energy drop, 2B would be a moderate one, and 9B or 4B would be a high energy drop. Lastly, 8A allows you to change the mood.