I have an old upright piano (slightly out of tune). First of all, I took the front off of the piano and put an SM-58 right in the middle and got a great sounding recording. I really like the sound ...
I have read that when recording through multiple microphones, that each microphone should be far enough away from each other such that the distance between mics is at least three times the distance ...
In a certain line-up of a live recording in a classical concert hall, there is a 50 persons choir situated behind a symphony orchestra with quite a few trombones, timpanies and a percussion section. ...