We purchased A Gift of Music for Y3 last year - the copy I bought (used on Amazon) didn't present any problems with chapters, pg. numbers, etc. This year, however, my D level DS just pointed out that our copy doesn't have the chapter numbers for last week or this week's assignments for Y4 (ch. 26,36 for wk.1 and 25 for wk.2). Aargh. Did I get a too-old copy? Is it that big of a deal that I need to purchase the correct edition for Y4, when he's already busy enough with everything else (we added Writing Aids this year)?