MUSIC
Audacity - recording and editing sounds
Audacity is free, open source software for recording and editing sounds. It is available for Mac OS X, Microsoft Windows, GNU/Linux, and other operating systems.
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GarageBand for Apple
Welcome to your personal recording studio — where it’s easy to make a song whether you’re a first-time musician or a seasoned pro. With GarageBand, you can create your own virtual onstage band and play along on your favorite instrument. You can record, edit, and mix a song exactly as you want it, in pristine CD quality. It’s the perfect place to get your act together.
iLife Tutorial
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Hydrogen - advanced drum machine
Hydrogen is an advanced drum machine for GNU/Linux. It's main goal is to bring professional yet simple and intuitive pattern-based drum programming.: