How about the first song or poem any of "us" ever wrote or tried too? :D
My first (song,lyrics only) was called,"I've Got A Rock In My Sock".
A friend of mine & I in San Diego (1978) were walking to somewhere (forget why) and we started making stuff up to pass the time.
He did a strange number called "Wearing Blue Jeans": "Wearing blue jeans is my game,they're all blue & all the same!"... etc.
Mine went:"I've got a rock...in my sock!"
"It hurt so much...I called Starsky & Hutch"! ...& so forth. LOL in the library! :D
About what you'd expect from a 10 year old. Long gone now though.
Later I went home & wrote 'em down.