"With a killer beat in place, it's time to add the second (mostly unsung) hero of modern music: the bass. Whether your tastes run to big, fat and bottom heavy or to quick, snappy and distorted, GarageBand has you covered. With GarageBand for iPad, you can create bass tracks that sound incredibly good with very little knowledge or expertise. Let's take a look at the simplest way to do just that: Smart Bass."
"GarageBand offers a selection of virtual guitar, bass, keyboards and drums that you play by tapping on the iPad's screen. To make music that sounds any good, you'll need to know how to play the real versions of these instruments."