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 a free royalty use melodic loop from Splice, which is listed below. I complemented it with an original lead, arp layers and the bass line, them all designed with Serum. I used Waves, Fabfilter, OTT and Ozone 9 for the FXs and the engineering.
Instrument Ambient arp
Sample pack Laxcity Sample Pack by Splice
Loop name LAXCITY_melody_loop_serenity_80_A#