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.
Drums, vocals and fx-es are samples.
Synths are come from Korg M1 and Avenger.
It contains a melodic loop from a sample pack.
The other melodies and midis are fully original.
Instrument Melody loop
Sample pack Producer Loops Pop Generation Vol.3
Loop name SS_PGV3_Words_Music_01_168_Gmin