Music controller in Blueprints - each song is its own primary data asset

I found this very interesting description of how Adam Block at Epic Games created a procedural implementation using Quartz. I need the initial music setup.
“We built a music controller in Blueprint that handles this logic. In short, it shuffles a playlist of songs and chooses a song at random. Once a song has been selected, all of the musical “stems” (bass, drums, melodies, percussion, chordal, and so on), are referenced as the “current song” and the Blueprint logic (which uses the Quartz subsystem) simply dictates what should play and when.”
I’m not sure how to set up the attached image.
If someone could either point to a video that does this, or help walk me through it I’d be enormously grateful.
The article I got this information from is here.

Thank in advance,

Jake