The base is original from the producer (chords and melodies), but is complemented with elements that complement the song that come from samplepacks, usually, vocal chops, guitars, wobbles sections, glitch effects. It is the standard in which most of producers work, in a project you will find MIDI files made by the producer, but also melodic loops.
Drill beat, 808 slides.
Sample pack Cymatics Monarch Melodies
Loop name Cymatics - Savior - 139 BPM A# Min