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Noise only when playing electric guitar, while recording

I recently bought a Shure sm57 to record my electric guitar amp. Problem is, while I am recording AND playing (so there's sound coming from the amp) there's a bzzzz when I playback what I recorded. When I stop playing (still recording) there's no buzz.
Also, when I record my own voice, there's no buzz at all.

What to look for when buying an electric mandolin?

Assuming I know nothing about mandolin's (not very hard) what do I look for when buying one? I like getting instruments from all of my travels, and the misses and I are going to paris and italy in a few weeks. We are looking to spend only a few hundred on this instrument. I was thinking an accordian at first, but those seem bulky and expensive. Any tips would be greatly appreciated!

The Room and Electric Guitar

Hey everyone, I was just wondering, when you're recording electric guitar and you're pointing say a 57 and another mic straight at your amp, and turning it up for that nice tube breakup, does the room really matter? Are they really sensitive enough to pick up room noise or ambiance at that volume level? This has something that I have always wondered.