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.
The melodies and Vox are 100% royalty free loops from BUYLOOPS and Splice.
The drums I made from scratch.
Instrument Melodies (Guitar, Strings)
Sample pack Dave Tamas - Midas Touch Vol. 3 (Loop Kit)
Loop name Coffee Shop 141 Emaj (Prod. David Tamas)