Achievements are a big deal for children, and its fun to celebrate their successes along the way. When students complete a lesson book level we celebrate with a "party" and mini-recital. After finishing the last song in a book, they choose a few of their favorite previously learned songs review for their practice assignment and then do a mini performance for me at their lesson. We spend the rest of the time playing games and top it off with a little treat.
I like how several of the apps and games used during piano lab also have built in reinforcement as they earn a new title by leveling up on Piano Maestro, become a "Rhythm Boss" on Rhythm Swing, or receive a standing ovation on Music Ace when they beat their own High score on a game.