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.
Most sounds made in Serum, some elements made on LABS, CUBE & more.
Instrument Vocal Loop
Sample pack nu.wav - Iris Lune: Dark Magic Vocals
Loop name NW_IrisLune_120_Vocal_Bouncy_Gritty_Loop_Gm