Press the piano keys to play them. If you prefer (and you should), you can use the keyboard to play them (the home row are the white keys, and the top row are the black keys). You play the keyboard using the keyboard exactly the way you would play them in Garageband. By that I mean the layout of the keys are similae to how they are actually laid out on the piano (unlike some other guy who thought it would be a good idea to do the same but with all the empty keys to the right) You can also use the left and right arrow keys to change the octave
I used the "pitch" sound effect instead of using the music extension. Features: - Chords - Recording - Different instruments - The notes stop playing if you release the key