Introducing GarageBand
"Making music has never been so natural"

Apple.com give details of a professional styled program.. for the sum of $49..
GarageBand turns your Mac into an anytime, anywhere recording studio packed with hundreds of instruments and a recording engineer or two for good measure. It’s the easiest way to create, perform and record your own music whether you’re an accomplished player or just wish you were a rock star. And GarageBand is the newest member of the iLife family, so you can add your original music to your slideshows, your DVD menus, burn it to CDs or score your iMovie projects.
NPR interview musician David Was advocate for "GarageBand"..