Audrey Hollow's 'Black Heart' came out on December 8, 2018. With this song being around four minutes long, at 4:20, 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 Black Heart and no other songs are present in the album, we classify this track as a single. In terms of popularity, Black Heart is currently 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.

Black Heart テンポ

The tempo marking of Black Heart by Audrey Hollow is Andante (at a walking pace), since this song has a tempo of 93 テンポ. With that information, we can conclude that the song has a slow tempo. This song can go great with yoga or pilates. The time signature for this track is 4/4.

Black Heart キー

A♭ Major is the music key of this track. This also means that this song has a camelot key of 4B. So, the perfect camelot match for 4B would be either 4B or 5A. While, 5B can give you a low energy boost. For moderate energy boost, you would use 1B and a high energy boost can either be 6B or 11B. Though, if you want a low energy drop, you should looking for songs with either a camelot key of 4A or 3B will give you a low energy drop, 7B would be a moderate one, and 2B or 9B would be a high energy drop. Lastly, 1A allows you to change the mood.