Marlo's 'Heartless' came out on February 14, 2020. Heartless is 2 minutes and 28 seconds long and may contain bad words that may be unsuitable for children. There is only one song in 1st & 3rd, so we believe that "Heartless" is a single. The popularity of Heartless is currently not that popular right now. Although the tone can be danceable to some, this track does projects more of a negative sound rather than a postive one.

Heartless テンポ

The tempo marking of Heartless by Marlo is Vivace (lively and fast), since this song has a tempo of 170 テンポ. With that information, we can conclude that the song has a fast tempo. The time signature for this track is 4/4.

Heartless 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.