How do you move Google Music into iTunes?

Hello - I have searched and not found a suitable answer: I purchased an album at the Android Market, but for the life of me, I cannot figure out where it is on my computer. Would someone give clear, step-by-step instructions as to 1) how to FIND my Google Music; and 2) once I've found it, how to get it/i drag it/ import it into my iTunes Library. Thank you very much. (This is vexxing!)

Tony V.