Option 1:

(To the tune of 'Hey There, Delilah') Example lyrics:

Hey there, Fluttershy

What's it like down in Equestria?

I'm a thousand worlds away

But, mare, you always look so pretty

Yes, you do

The sun can't shine as bright as you

I swear, its true

Hey there, Fluttershy

Don't you worry about the villans

I'll be here if you get lonely

Give this song another listen

Close your eyes

Listen to my voice, it's my disguise

I'm by your side

Oh, it's what you do to me

Oh, it's what you do to me

Oh, it's what you do to me

Oh, it's what you do to me

What you do to me

Option 2:

(To the tune of 'Sandy' from Grease) Example Lyrics:

Sitting at the TV, looking a fool.

What will they say?

Am I uncool?

Rarity, can't you see I'm in misery

I watched the show, Im at a low. there's nothing I can do

Keep it cool, it's so cruel. I kept it all inside- oh, why, this cant be, oh Rarity.

Oh Rarity baby, someday, when this show is done. 

Somehow, someway, our two worlds will be one

In Equestria forever and ever we will be

Oh, please say you'll stay, oh, Rarity

Option 3:

An excert from any song of your choice (Parody or non-parody)