While you can add Apple Loops and import samples to use in your GarageBand creations, you can also use an onscreen keyboard to make music. On Mac, you can use the keyboard as it appears on a piano or organ in addition to musical typing with your computer keyboard. And on iOS, you can tap to open the keyboard and adjust its settings easily.
For making music in GarageBand your way, here’s how to show the keyboard on Mac, iPhone, and iPad.