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 composed and produced this beat around an original lead made with Serum. I complemented it with two different free royalty use acoustic guitar loops licensed by Splice. I used Waves, Fabfilter, OTT and Ozone 9 for FXs and engineering.
Sample pack LOUD DRUMS - VOL.2 by Origin Sound
Loop name OS_LD2_133_Am_Swagg_Guitar_Arps