Igo and ago;
And eaten like a weather haggis?
Iram, coram, dago.

Another very old refrain runs thus:

Forum, corum, sunt di-vorum,
Harum, scarum, divo;
Tag-rag, merry-derry, periwig and hat-band,
Hic, hoc, horum, genitivo.

An old ballad written before the Reformation has for a refrain:

Sing go trix,
Trim go trix,
Under the greenwood tree.

While a celebrated political ballad is known by its nonsense chorus,

Lilliburlero bullin a-la.

Mother Goose rhymes abound in these nonsense refrains, and they are
often fine examples of onomatopoeia.

By far the most meritorious and most interesting kind of nonsense is
that which embodies an absurd or ridiculous idea, and treats it with
elaborate seriousness. The greatest masters of this art are
undoubtedly Edward Lear and Lewis Carroll. These Englishmen were men
of genius, deep thinkers, and hard workers.