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.
10 layers of Leads, 7 of bass, 4 chords. Sylenth, Kontakt bookstores Albion One and Alicias Keys, TruePianos and Nexus were used. For the mix used bundles from FabFilter, Izotope, waves and endless smile.
Sample pack Musicore - Lost Vol. 2 - Progressive House Sample Pack
Loop name MusiCore - Lost Vol 2 Guitar - 1 (B) (128 BPM)