SproutBeat Free with upgrade to $19.99
This is a favorite of many piano teachers because it offers 400+ music worksheets at a mere finger tip. The free version includes 25 downloads while the upgrade provides access to a categorized library of worksheets with weekly additions. The colorful worksheets can be used repeatedly as students write answers directly onto the iPad. With a tap of the trash can icon, completed worksheets are cleared and ready for use by another student. Although there is no need for paper or ink, there is an option to print the worksheets if desired.