Open GarageBand, and create a new session by clicking “New Music Project.”
Click the “+” in the bottom left corner to add a new track to GarageBand.
Choose “Software Instrument” from the window that appears.
Click “Create” and a new software instrument track will appear with the “Grand Piano” as its default sound.
Click “Track” at the top of GarageBand, and click “Show Track Info” if you wish to select a different piano.
Select the “Pianos and Keyboards” category in the “Track Info” window, and choose the piano setting of your choice.