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 produced this beat by combining multiple free royalty use melodic loops which are listed below. I used Waves, Soundoys, Fabfilter and Ozone 9 for FXs and engineering.
Sample pack Sounds By MdL V3 by Splice
Loop name MdL_TMS_Guitar_Loop_-_90_BPM_-_G_Major