Secrets's 'Iron Hearted' came out on August 21, 2020. With this song being around four minutes long, at 3:54, the duration of this song is pretty average compared to other songs. This track is safe for children and doesn't appear to contain any foul language, since the "Explicit" tag was not present in this track. Because this song is the only song in Iron Hearted and no other songs are present in the album, we classify this track as a single. In terms of popularity, Iron Hearted is currently below average in popularity. Although the tone can be danceable to some, this track does projects more of a negative sound rather than a postive one.

Iron Hearted テンポ

We consider the tempo marking of Iron Hearted by Secrets to be Andante (at a walking pace) because the track has a tempo of 102 テンポ, a half-time of 51テンポ, and a double-time of 204 テンポ. Based on that, the speed of the song's tempo is slow. The time signature for this track is 4/4.

Iron Hearted キー

This song has a musical key of F♯ Major. This also means that this song has a camelot key of 2B. So, the perfect camelot match for 2B would be either 2B or 3A. While, 3B can give you a low energy boost. For moderate energy boost, you would use 11B and a high energy boost can either be 4B or 9B. Though, if you want a low energy drop, you should looking for songs with either a camelot key of 2A or 1B will give you a low energy drop, 5B would be a moderate one, and 12B or 7B would be a high energy drop. Lastly, 11A allows you to change the mood.