How I Use It
I connected my iPad 2 to my SmartBoard and used it in a whole class experience. I used it for discussing the instruments of the orchestra to my younger learners. The app worked as intended.
This app was "cute". It had very simplistic cartoon drawings of performers in an orchestra. One nice feature that it did have was the ability to turn the performers on or off. This way I could show the students the individual parts of the composition being performed. The app was not real engaging and the students lost interest after two class periods.
If the app was free it would be worth your while. Other than that save your $1.99.