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I would like to use our MacBook Pro to record music my daughter plays on her MIDI keyboard as well as her voice. What kind of hardware/software do I need for this?
There are many brands of MIDI to USB adapters available on the market. They cost about US$40 or less. Here is one example, the M-Audio Uno.
She can record her performances on GarageBand, which is a piece of Apple software that comes free with the MacBook Pro.