"Rebecca's Song" is a song written and sung by Kyle Broflovski in the Season Three episode, "Hooked on Monkey Fonics".
Background
Kyle Broflovski falls in love with Rebecca Cotswolds. The two met at the 15th Annual South Park Spelling Bee Finals.
Kyle sings this outside to her window, as her parents will not allow her to have friends or go outside.
Lyrics
Everywhere I go, I'm thinking of you, Rebecca.
I don't know what to do, Rebecca.
You're so nice, I'd like to get to know you better.
So what do you say we get together?
You really are quite good-looking, Rebecca!
You really are quite good-looking, Rebecca!
Rebecca, you're really quite good-looking!
You're a fox!