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.
Process note
Every melody is made by me, except for the string at the beginning. This string is from a sample pack from KSHMR.
Melodic loops
Instrument String
Sample pack Sounds Of KSHMR (Vol.2)
Loop name KSHMR Kemenche (86, Em)