http://www.apple.com/ilife/garageband/
Don't have it myself but a guy here in work has it and says it is great. Now he does mostly sound recording and mastering so I'm not sure what you're after in that sense.
Other programs that people in the profession use are Peak, which requires a lot of programming knowledge:
http://www.bias-inc.com/products/peakMR/
There is always Logic, which also has a hefty pricetag (see the Apple site).
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