Regarding the ? about Arlington arts...
Art classes are done in minutes, so the # of x/week may vary by school but not the minutes/week. Let me see if I can remember what my 1st grader had last year....
art 90 min (2x45 min)
music 90 min (2x45 min)
Plus PE (2x45) and Spanish (3x45)
These are to the best of my recollection (ha!) so don't quote me. But more than the amount of time, which is great, I've been impressed with the quality of the work. It's true art ed, not arts & craft time, from what I've seen. Also integrated nicely with the curriculum.