Kiki made "Heart of Stone" available on May 14, 2021. The duration of Heart of Stone is about two minutes long, specifically at 2:36. This song does not appear to have any foul language. Heart of Stone's duration is considered a little bit shorter than the average duration of a typical track. Because this song is the only song in Heart of Stone and no other songs are present in the album, we classify this track as a single. Based on our statistics, Heart of Stone's popularity is below average in popularity right now. Even with the track produces more of a neutral energy, it is pretty danceable compared to others.

Heart of Stone テンポ

We consider the tempo marking of Heart of Stone by Kiki to be Allegro (fast, quick, and bright) because the track has a tempo of 126 テンポ, a half-time of 63テンポ, and a double-time of 252 テンポ. Based on that, the speed of the song's tempo is fast. Activities such as, walking, can go well with this song. The time signature for this track is 4/4.

Heart of Stone キー

This song is in the music key of C Major. 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.