Meet Nolan Gasser, chief musicologist for Pandora and architect of the Music Genome Project. Gasser has categorized more than 500 unique genes across seven genres of music, and his genome project is the most extensive categorization of music in history. Now, Gasser is trying to create data-driven music therapy. “Musicology,” which is directed by Jamie Schutz, is part of the “Collectors” series from FiveThirtyEight and ESPN Films.