I jointed the playgroup one hour per week at the nearby
kindergarden. The first 3 lessons my son do not pay
attention. He just walked aside, playing himself. At the
group singing, he won't join and sreamed all the time. But at the 4th lesson, I managed to get him sit down on my
lap, at least listening to the teacher for whole 10-min
singing session. For me, it's already a great progress.