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.
Process note
Melodical elements in this beat are guitar loop and flute melody made with BBC Symphony Orchestra. I modified loop by changing pitch and adding effects over it.
Melodic loops
Instrument Guitar
Sample pack Origin Sound - PULL UP
Loop name OS_PU_140_F#m_Drowsey_Song_Starter