This is kind of hard because, well, I can’t sing it to you, but here goes:
It’s a song that typically features a trombone and is often featured in kid’s music.
it goes something like this:
na na na, na na na, na na na na
naaaaaaaaaa-aaa (trombone part)
it’s kind of like the trombone is ‘racing’ or dueling. It’s a fast paced song.