Hermione:
I'm a Hogwarts girl, in my Hogwarts world
I do magic, it's fantastic
Ghosts fly everywhere, pixies in my hair
A vacation from Muggle situations

Ron:
Wizards, witches, snakes, and snitches

Hermione:
I'm a hard-working girl
In this non-Muggle world
I do spells, I save Ron, I save Harry

Ron:
You're a know-it-all girl
And I almost could scream
Your obsession with homework is scary

Hermione:
You can laugh
At my wa-ays
But my O.W.L.S
Are better than yours
Oo-oo-oo
I'm a Hogwarts girl, in my Hogwarts world
I do magic, it's fantastic
Ghosts fly everywhere, pixies in my hair
A vacation from Muggle situations

Ron:
Wizards, witches, snakes, and snitches

Hermione:
And the homework!

Ron:
Spells and flying, Snape defying

Hermione:
S.P.E.W.! S.P.E.W.!

Thanks to Catrina Gandor!