It sounds as though this set the precedent for "I, Zimbra" by Talking Heads.

https://open.spotify.com/track/2zdlkG9g5Mt0alUdqn7s3D?si=L1N...

I zimbra used an existing nonsense word poem by Hugo Ball which predates this by quite a bit.

I’m drawing a blank on the 60s or 70s pop song which had fake non English lyrics in some part of it. Amusingly in this context, the French lyrics in Psycho Killer are legitimate.