Dude, where even to begin? I don't want to get into a one-upsmanship nerd-fest about it, but I'll throw out another obscure one to match McLaughlin. After years of hard rock and whatnot, Elliot Smith has brought me back down to fingerpicking, just a guitar and a mic. Whether you like his music or not, his technique is extraordinary, unique, and innovative. Died before his time, too, which cements his cred.