There are a few use cases where the iPad really, truly excels - and one of those is replacing sheet music. Keep your whole library on one device instead of lugging around binders full of paper, and make (editable, scalable!) annotations using the touchscreen. All it needs is a good way to turn the pages - and it's about to get that, too. AirTurn, a maker of USB-based page-turning pedals, is developing a Bluetooth version that will connect wirelessly to the iPad. Well, that does it - so long, paper sheet music!