Zonami, heartsicotine's 'Flatline' came out on November 20, 2023. For a fairly short song, this song is "Flatline" is considered an explicit song with a duration of 1:49. Because this song is the only song in Flatline and no other songs are present in the album, we classify this track as a single. The popularity of Flatline 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.

Flatline テンポ

The tempo marking of Flatline by Zonami, heartsicotine is Vivace (lively and fast), since this song has a tempo of 160 テンポ. With that information, we can conclude that the song has a fast tempo. This song can go great with running. The time signature for this track is 4/4.

Flatline キー

The music key of this track is A♭ Major. 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.