LBTL #9 is here: "Monkey Gone to Heaven" by Pixies, from their 1989 album Doolittle. In less than three minutes, this song tackles the themes of spirituality, environmentalism (a reminder to CITO!), and numerology.
Hopefully this puzzle won't be too difficult. If you don't know the theme of this series, check out the page for LBTL #1.
https://www.youtube.com/watch?v=EHC9HE7vazI
A Note on GZ:
While looking for the cache, you may come across some brightly colored blue wasps. These are most likely blue mud daubers (Chalybion californicum). Try not to hurt them! Blue mud daubers are not known to be aggressive. While hiding the cache, one even flew into my arm and it couldn't get away fast enough. However, I am not making any promises that you won't get stung.
They are also the primary predators of black widow spiders. While I didn't see any spiders at GZ and black widows are rare in this part of Illinois, large blue mud dauber populations can indicate large black widow populations. Again, I make no promises you won't get bitten. If you are worried about arthropod attacks, you may want to wear a pair of gloves and/or use a mirror. In the interest of safety (and ease), YOU DO NOT NEED TO REACH INSIDE THE HOST TO FIND THE CACHE.