Who hasn't blown across the lip of a half-empty pop bottle and marveled at the richness of the tone? As for what tone it was, however, that was anybody's guess. Well, no longer. We've calculated just how much water you need in eight 20-ounce pop bottles to create a major scale. Affix numbers to each bottle, 1 through 8 (or use different-colored stickers for younger kids), and jam away. Your first song? How about "Row, Row, Row Your Boat"?

THE MAJOR SCALE
Do -- 7 ounces
Re -- 9 1/2 ounces
Mi -- 12 1/2 ounces
Fa -- 14 ounces
Sol -- 16 1/2 ounces
La -- 17 1/2 ounces
Ti -- 18 1/2 ounces
Do -- 19 ounces

ROW, ROW, ROW YOUR BOAT
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TIP: You can sharpen your chops by employing a piece of flexible plastic tubing. Rather than try to move your mouth from bottle to bottle, hold one end of the tube in your mouth and move the other end from bottle to bottle.