from Headphones Required (Ultimate Special Deluxe Bonus Edition Tracks), released December 13, 2016
Free-use:
Cat sounds from a vast number of online sites
Breathing samples from some youtube supercut thing that nobody can really pinpoint who owns it
Rights Reserved:
Loop from "Nyan Cat", owned by Daniwell-P and Momone Momo UTAU
Samples from The Office, owned by NBC Universal Television
Loop from "Play Him Off, Keyboard Cat", owned by Charlie Schmidt
Vocal Sample from Ian Carter