Cause there are 3 guitarists, why would just one of them play the solo if they can combine and play the shit out of that! They did the same thing with November Rain if I'm not mistaken. It's quite cool, I'd say. It fits there.
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+1
Yeah if you listen good to the original recording of Sweet child O' mine on Appetite for destruction,
you hear that 2 guitars are playing the solo, the first part without the wah pedal and when that parts end the wah pedal comes in and if you listen good it is mixed together with another guitar.