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
I used loop in the drop from Splice (it's 100% royalty free). I used Serum, Nexus 3, Ozone9, Fabfilter, Waves, Valhalla and other plugins. This track is professional and melodic. Have time to buy a track before you are overtaken, there will be no second chance.
Best Regards, SaeTMusic.
Melodic loops
Instrument Vocal Chops
Sample pack Vocal Deep House Dropgun
Loop name DS_VDH_126_Vocal_Chop_Loop_Wet_Swim_C#m