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.
Worked first on a drop with the choppeds and after that, put a vocal and created a great piano to groove in break, everything together sounds really cool.
Sample pack The Husk - SLAP HOUSE ESSENTIALS V15
Loop name _RGD_BS_SP-H_126BPM_GUITAR_LOOP_Gmin