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If your DS loves music then he is likely to enjoy the A level course but will need to set aside plenty of time for practice as well as theory study. But if he really enjoys it then this should be a pleasure for him rather than a chore and a good outlet for his creativity which can also be a stress-reliever. Perhaps he could even think about teaching the instrument he plays to younger children as a way of earning some money? If not now, then maybe when he goes to Uni? Your DS is really lucky to have been blessed with a musical gift!
Thanks honeykate, he does love music and has just sat his grade 5 theory, he is in 2 senior orchestras, one at school and one on a Saturday :D I just didn't want him to be under too much pressure but what you said makes sense. We've had a little chat and he has chose music