Move music from old iTunes account to new account

I am going to college and have bought a new Macbook. In the past, i have downloaded music from itunes and put CD's onto a computer authorized with my dad's account. He already has authroized five itunes accounts on different computers, so i have set up a new itunes account on my macbook. However, now that i have a new account, i am wondering how to transfer the music from the old computer to the new computer with a different account and whether apple will let me play the music since the computer is not authorized to the same account in which they were purchased. Any ideas on how to do this or get around this would be appreciated! Thanks!!