The first sound you hear on Nirvana's 'Smells Like Teen Spirit' is Kurt Cobain's guitar, but it's Dave Grohl's introductory drum fill that really gets things going. That percussive blast sparked the '90s alt-rock revolution, but if it hadn't have been for Grohl's wise mother, the war might not have had its opening shot. When Grohl met Cobain and bassist Krist Novaselic, he was on tour with his buddies in the D.C. hardcore band Scream. Kurt and Krist asked him to join their group, a Seattle outfit of some renown, but he was torn, so he asked his mom for advice. "She told me there are times in life when you have to do what's best for yourself," Grohl told the Guardian. Would 'Nevermind' have been as good without Grohl? Would Nivana have blown up? Would Winger still be on the charts? Thanks to Mama Grohl, we never had to find out.

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