What microphones are compatable for I am tpain HELP!!

I wanted to know if any microphone will work for the I am tpain app. I have a microphone that fits into my ipod 2nd generation but i wanna know if it will work with i am tpain before buying the app. ANyone know?

If it works for voice memo, it will work for T-Pain. All mics with that size plug will fit, but not all will work. Mine cost 20 bucks on Amazon. Get one with headphones if you want to hear the beats while you sing.

it does work, i just tried it out with my 2nd gen and mic