During "Unhappy Landings"
The first insect he heard was a grasshopper, the whirr of its wings as it leapt onto his shirt. The second was the metallic chainsaw of a cicada, not that he knew what a chainsaw sounded like. The third was the cheerful, creaky chirp of a cricket.
He loved the sound insects made. They made the world sound alive. That's why when the marshal mentioned beetles singing in German he thought that was a fantastic idea. Beetles should sing in German, crickets in Chinese, and cicadas in Klingon. Finding out later about the Beatles only made him love insects more.