Earthlings love music and listen to it all day on tiny devices. They also believe that laughter is the best medicine for sadness. Strangely, they let animals sleep right in their beds!

Welcome to Earth grammar! When speaking generally about uncountable nouns (like music and laughter) or plural nouns (like animals), we drop the article completely.

Using "the" would mean Zorblax is talking about very specific music, specific laughter, or specific animals, rather than these concepts in general.