To anyone who does music recording: This website beautifully demonstrates the different results you can get with different mic positions and techniques.
Posts under The Experiment of Recording have interactive, illustrated recordings where you can switch between different mic feeds from the same performance on the fly.
The Research on Classical Music Recording - for the future of music production and recording
http://kazuyanagae.com/
^ This is best experienced with properly-positioned speakers rather than headphones, as this will allow you to hear the differences in spatial imaging created by different setups.
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If you REALLY want to learn this stuff, this book is a good place to start: