Harry and Draco harmoniously sing the Dueling Club Song, to the tune of Shall We Dance from The King & I.

When we were introduced
We became enemies
But when this club began
You were assigned my partner
So many pairs of students
Are starting to face off
It made me think we might be
Similarly occupied
>Shall we duel
On a burst of adrenaline
Shall we duel
Shall we duel
Shall I then say "Expelliarmus!"
and mean "Die!"
On the clear understanding
That these accidents can happen
Shall we duel
Shall we duel
Shall we duel