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.
I made this track using a synth called Phaseplant and Hive. This vocal is 100% Royalty Free.
Instrument Guitar and Brass
Sample pack F9 Audio - 21St Century Soul Deluxe Version
Loop name F9 Lockdown Maxi Riff 2 90 Gmin