Due to the technological advancements of plug-ins, analog to digital converters, and VST technology, you can produce music on a laptop, but there are a few reasons why you wouldn't want to.
Right off the bat, I have to say that the MacBook Air is not the best computer for music production, due to its inherent limitations, for instance, the amount of RAM and the Processor...
In this article, I explore PianoForAll, the downloadable digital program for those of us who want to learn how to play the piano. Obviously, skills on the piano will help you as a music producer.
Here's how to use the Quantizer function in Garageband, including some helpful tips, and other things to consider.