How does the composer for FX’s Legion craft the “sound of insanity”?

Composing the score for a show like Legion may be easier said than done, given the mind-bending nature of the visuals and the existential themes the music accompanies. Tasked with the Herculean feat of putting David Haller’s insanity on wax is composer Jeff Russo. In the video above, we get an idea of Russo’s process and how he came up with Legion’s eclectic auditory identity.