We do one artist and one composer per term. For art, we do one painting a week. I know most CM families linger on each picture for longer, but there are too many good paintings, so weekly it is. We do it how Sonya describes in the YouTube video on picture study. For composer study, we are always listening to good music. Sometimes we read from a biography once a week, sometimes not.
My kids keep binder timelines like these ( http://joyouslessons.blogspot.com/2012/10/first-grade-in-our-home-timelines.html?m=1 ) and add the artists and composers to them.
P.S. Our kids are close in age. Mineare 11 (12 in September), 7, 6, 4, and almost 18 months). 🙂