#1
Whats the deal with some folks putting those hair bands on the guitar?
They are put up by the nut.
#2
It mutes the open strings so you get fewer unwanted noises when you play fast. It's especially useful playing legato as it saves you having to grab the neck with your right hand, but people use them for all kinds of fast stuff. Just makes the whole sound cleaner. Some people say they're a necessity for clean recording; they're certainly very useful.
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I'm a moron tho apparently and everyone should listen to you oh wise pretentious one