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.
A free looperman sample was used, and the rest of the beat was made and mixed by me .. there is a LABS piano, a Labs vocal pad and a Labs string, all free
Sample pack Looperman
Loop name Assignment - Piano Melody