* Repetitive melodies and rhythms: Heartless music often features repetitive melodies and rhythms that can become hypnotic or trance-like.
* Loud, aggressive sounds: Heartless music can be loud and aggressive, with harsh, distorted sounds and heavy use of percussion.
* Dark, minor key melodies: Heartless music often features dark, minor key melodies that create a sense of foreboding or unease.
* Lack of dynamics: Heartless music may lack dynamics, or changes in volume and intensity. It may sound flat or one-dimensional.
* Use of electronic instruments: Heartless music often makes use of electronic instruments, such as synthesizers and drum machines, which can create a cold, sterile sound.
* Absence of human voices: Heartless music may not feature any human voices, or may only use them in a distorted or manipulated way.