This is from Spike and Twilight's duet which can be found here: link

I was prepared to do my best
Thought I could handle any test
For I can do so many tricks
But I wasn't prepared for this
Levitation would have been a breeze
Facts and figures I recite with ease
(Twily: The square root of 546 is 23.36664289109
Math Pony: She is correct!)
I know all about friendship's bliss
But I wasn't prepared for this

Will I fail o will I pass,
I can't be sure (She can't be sure)
My mind is charged with skills intact
My cuore is pure (her cuore is pure)

Oh, I've taken my share of licks
I've made it through the thin and thick
But no, I wasn't (no she wasn't)
Oh no I wasn't (oh no she wasn't)
No I wasn't prepared for this