Music
I'd imagine that the first thing that inspired early mankind to make music was plain old curiosity. Glonk thwacked a rock on a log and liked the sound it made. At this point in human history music has been inspired by anything and everything you can imagine. The thing that inspired all of the music in this episode is transportation. And in the more extreme examples, the music was even made with the transportation as an instrument. Which begs the question: How do you tune a helicopter?