Asperger syndrome is a PDD (pervasive developmental disorder).
Pervasive - complete, total and all encompassing, through and through, not just on the surface
Development - how we learn, how we interpret, how we perceive, how we change with experience
Disorder - that's debatable, but it can be a burden to be different, it can also be no big deal depending on the person's experiences, interests and his degree of "Aspieness".
Mainly, accept that he is who he is, which is quite unique and that he will never be like you, no matter how you try to affect him. Some of his interactions may be very awkward at times and he may decide that it's just not worth it to join in with what seems like the simplest things to you. There is no linear scale of predictability concerning his actions or reactions, abilities or challenges. You will have to get to know him.
Are you really sure you want to deal with all this? If so, then good for you, because he probably needs to have more friends. Keep studying and in a few years you will start to understand more.
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It's just music for me. The other stims don't work.