Miking a piano is surely challenging, particularly in live-performance settings. Here are a few takes on it — worth reading whether you actually need to mike a piano or not, because they say a lot about the nature of a piano’s sound (I found at least one of these articles interesting because it changed the way I think about piano samples).

Curiously, very few articles talk about miking uprights, because they don’t get no respect. This one does:

This one has a budget-conscious option:

And for real geeking-out, here’s an engineer from ECM:

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