windows iTunes to mac iTunes

I have a friend running windows who has loaded his considerable personal music collection into iTunes and stored it on an external hard drive. He has offered to share it with me. Is there a simple way to transfer the music from his external windows hard drive to my iMac? Obviously the formatting is different, but is there a way around this. I don't care about his playlists just the music.

I think it would be just as simple as plug in and upload. Im not sure but i think the format would be the same apple is smart like that. If the songs were purchased on iTunes, you should be able to go to file (in iTunes) and hit transfer purchases.

Im not 100% sure if Im wrong sorry, I don't have an experience with transferring music through hard-drives. let me know how it goes