⁹₉⁹'s 'Heart Racing' had a release date set for August 16, 2023. Heart Racing is explicit and may not be suitable for children. With the duration being about 3:35, this song is close to the average duration of a typical track. Because this song is the only song in Heart Racing and no other songs are present in the album, we classify this track as a single. Based on our statistics, Heart Racing's popularity is not that popular right now. Although the overall vibe is very danceable, it does project more negative sounds.

Heart Racing テンポ

We consider the tempo marking of Heart Racing by ⁹₉⁹ to be Allegro (fast, quick, and bright) because the track has a tempo of 146 テンポ, a half-time of 73テンポ, and a double-time of 292 テンポ. Based on that, the speed of the song's tempo is fast. Activities such as, jogging or cycling, can go well with this song. The time signature for this track is 4/4.

Heart Racing キー

C Major is the music key of this track. This also means that this song has a camelot key of 8B. So, the perfect camelot match for 8B would be either 8B or 9A. While, 9B can give you a low energy boost. For moderate energy boost, you would use 5B and a high energy boost can either be 10B or 3B. Though, if you want a low energy drop, you should looking for songs with either a camelot key of 8A or 7B will give you a low energy drop, 11B would be a moderate one, and 6B or 1B would be a high energy drop. Lastly, 5A allows you to change the mood.