Lubov identified a new track that played in "The Curse of the Hex": "Why Am I So Poor? B" by Laszlo Borteri. Thanks!
EDIT: Also, MAKEBELIEVE identified "America a Dream Comes True" by Gregor F. Narholz as playing in "Snowball Effect."
EDIT 2: Lubov also identified "Mad Street" by James McConnel as playing in "Frozen Face-Off."