Is Billy Corgan an Underrated Guitarist?In his new book, I Am One: The Smashing Pumpkins Story, 1988-1994, author Greg Prato proposes that Billy Corgan was one of the top guitarists to come out of the '90s alt-rock world, with evidence from The Frogs' Jimmy Flemion, Blind Melon's Christopher Thorn, Matt Pinfield, and more.