This is the standard that most of producers work on. In these type of projects the base is original from the producer — chords, melodies, leads, etc — but it contains additional melodic elements that complement the track and come from royalty-free sample packs. They are usually vocal chops, real instrument chords or textures, wobbles basses, glitch effects, etc. In a project file of this category you will find MIDI files created by the producer, but also melodic loops
I made the bassline following the melody of the sample, then I put a vocal that matched and built the rest of the track.
Instrument Melodic Loop
Sample pack Scrilla - USA Style Trap
Loop name PMSC_Melodic_Loop_160_E_Loud_Town_2