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which is exactly the role of the thumb in classical guitar

so this is solving the fact that using a guitar pick forces you not to use your thumb

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I’ve not played classical guitar but on a standard electric guitar I just don’t have the finger length to fret the low e and the higher notes at the same time, and I don’t have freakishly short hands either. So it can help with that, pick or not.
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I thought on an electric guitar the strings are closer together though? And the neck is thinner?
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