Tom Lehrer gave away his songs, relinquishing all copyrights, claims, anything (tomlehrersongs.com).

I've been listening to Tom Lehrer's recordings since his first album was a sort of underground sensation - a very savvy older sister-in-law involved in the entertainment industry on both coasts loved playing those wickedly subversive songs so much - and over the years I came to "get" the songs. Thanks, Professor, you done good.

I cheered at the banderilleros' display
As they stuck the bull in their own clever way
For I hadn't had so much fun since the day
My brother's dog Rover
Got run over

(Spoken)
Rover was killed by a Pontiac. And it was done with such grace and artistry that the witnesses awarded the driver both ears and the tail " but I digress...