Dimondium reworked the midi for Becoming Popular that KitRifty shared a few days ago. This version is a very cool ensemble with an assortment of instruments (piano, clarinet, guitar, tuba, violin, flute, trumpet, french horn, cymbal, drum set, marimba, etc...). So if you have an extremely awesome school band, this is definitely the piece for you!
There's a score (.nwc format—that's Noteworthy Composer) and a recording. If you click through the video, Dimondium also included a mp3 download link. Many thanks to Dimondium and all our other contributors!
PS. Have you watched the finale yet?! No spoilers, but I will say that it made me go "EEEEeeeeeeeee!"