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.
4 bass layers
6 Percussion layers
4 melodic layers
Sample pack Cristina Soto - Vocal Atmospheres
Loop name CSVA_LONG_D_MAJOR_12