The simple answer: Because they’re not primarily musicians, and when they release music it’s usually in connection with their TV projects. That being said, since their talkshow (where The Fox and most of their other famous music videos originated) ended in 2016, they’ve released a bunch of new songs through Stories from Norway (2018) and Ylvis i Sogn (2022), and although their current project is an improvisation based game show that probably won’t result in any new releases, I’m sure they’ll release more music in the future.