Recording a live piano performance with GB and iMac internal mic

I am a complete novice with GB. My iMac sits six feet away from my piano, and in a few days my piano teacher will play a concert on it. I am into digital photography, but have no video recording equipment. Can I record this performance using GB and my iMac internal mic, and, if so, how? I would understand completely if you refer me to an article or other secondary source where this is covered.

You will certainly benefit from the mic upgrade. Be aware that most "studio mics" require a microphone preamplifier to bring the level up to something that your computer will be able to see (as well as to provide power if the mic requires it). If the connector is the type that looks like a headphone plug which will fit in your computer input, you are probably ok.
The recording quality will normally be determined by the format and settings instead of the application you are using to record. Stick to 16 (or 24) bit, stereo .aif files and you should be fine. The standard for CD recording is 44.1kHz.
For some information and advice on recording piano, there is an article on my website here: http://doghouseNYC.com/articles/piano1.htm
Good luck!

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