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.
In this track I used Serum, Sylenth1 and TruePianos.
Best Regards, SaeTMusic.
Instrument Vocal Chops
Sample pack Splice Sounds - Sounds of KSHMR Vol.3
Loop name KSHMR_Vocal_Melody_11_102_Gm