Help Sorry- Newbie question

It's probably been asked before, but I cant find the answer.

Just got a Samsung Galaxy SII. I want to know if it is possible to transfer any mp3 music I may buy to my sd card to itunes, should I wish to move to an iphone in the future?

I just dont want to buy a load of music that is incompatible with itunes. As you can tell, I have no idea about this stuff.

Would really appreciate any advice.