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.
Bells loop was modified with effects. Recorder melody is made from scratch with FLEX.
Sample pack Origin Sound - BANDZ
Loop name OS_BNZ_135_Cm_Spooks_Lofi_Bells_Chords