Absolutely agree. Same goes for the refrains to many folk songs, but be careful, not all of them are gobbledygook. For instance the long refrain in keemo kimo /frog went a courting, can be traced back to 18th century cant words.

Koymanero, kil kil kero
koymanero koy me
Plimslim slamadiddle I'm a bull a ringdum bullidum a koyme.