As if you needed another reason to go to the South by Southwest music festival in Austin this summer, Dave Grohl and his Sound City Players supergroup have announced that they will be performing. The group of musicians that includes rock legends Rick Springfield, Stevie Nicks and John Fogerty were all featured in the Foo Fighter frontman’s recent documentary Sound City. The film (you can read our review here) looks at the rise and fall of the legendary Sound City music studio in California where some of the most influential records of all time (from Nirvana, Fleetwood Mac, Tom Petty, Elton John and other music icons) were recorded …