This WordPress Blog "Technology in Music Education" has tons of information as to ideas to inspire your classroom. The link above gives a list of apps and accessories to that can be used in your classroom! Take a look!
This link gives wonderful advice on how to create lesson plans on your iPad. Planbook or DayBook Pro are the two apps discussed in this article. I know not everyone owns an iPad, but I have used my immensely since I have purchased it! Check into a refurbished model. It is less expensive, yet works very well (if not just as well as a new one!)