One example I'll show in class is J Dilla's "Lightworks":
Which lifts heavily from a Raymond Scott tune:
With a bonus look at Chris Ware's "Lint":
Which is a response to James Joyce's "Prtrait of the Artist as a Young Man," which begins:
Once upon a time and a very good time it was there was a moocow coming down along the road and this moocow that was coming down along the road met a nicens little boy named baby tuckoo… His father told him that story: his father looked at him through a glass: he had a hairy face. He was baby tuckoo. The moocow came down the road where Betty Byrne lived: she sold lemon platt.