Suggestions welcome

I want to record my vocal class. It's not like I want to listen to myself over and over again, but I have one half-hour class a week and my homework for this week looks like this:

Straw Breath (low in body)
Pant 1-5
Double
Hum
Motor Boat Lips
Minor 3rd C-A oo
He or Ho Pelvic Bone
Over the Air Egg 0


Now. I am 43 years old. I am currently doing two jobs. I am also currently doing a university stats course and am the volunteer registrar for the group that coordinates all of the volleyball that goes on in the province of Nova Scotia. (That was a dumb idea, by the way.) Do you think that by Tuesday I can remember what the hell He or Ho Pelvic Bone is supposed to sound like?

So I would like to record my lesson. As I said, it's half an hour long. I don't so much care about the quality, and I'm really not interested in hearing myself sing. I want to just be able to remember what He or Ho Pelvic bone is supposed to sound like so I can do it at home.

Any suggestions? I suspect a half hour long .wav file would take way more memory than I have on my phone, and I don't think my iPod touch can record sounds... though I could be wrong.