What is better?

Hi everyone!
I am newbee on this forum and I really like to be here )))
Now could you guys help me with this?
My father is an iTunes subscriber. He purchased some songs for me. And, of course, I cannot play them on my PC or burn to a CD because they need to be converted.
So I'm trying to find a converter that will convert itunes songs to mp3. Please recommend me one you used.
Thank you!