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.
sample obtained in the free use splice. the whole mixing and mastering process was done by me
Sample pack Splice
Loop name DBM_SSP_SIDECHICK_COMPOSITION_96BPM_Cb-MINOR