Supergroups are not really a novelty or a shock, but what Dave Grohl is planning is just crazy: he wants to create a group called the Sound City Players, with Fleetwood Mac’s Stevie Nicks, Nirvana’s Krist Novoselic and Pat Smear (long time colaborator, Creedence Clearwater Revival’s John Fogerty, Foo Fighters’ Taylor Hawkins, Nate Mendel and Chris Shiflett, Alain Johannes, Chris Goss, Cheap Trick’s Rick Nielsen, Rage Against The Machine drummer Brad Wilk and more (not…