It was a good idea the first time, and it’s a good idea now, although four discs worth of ’70s covers does seem to be pushing things to the saturation point.
Packing down mid-tempo arena stompers like the children of the Nuge/Aerosmith ’76 tour, the bad-ass Green River side of grunge, and snot-thick stonesisms.
Sucking the ’70s succeeds where so many before have failed because the concept encapsulates such a large chunk of space and encourages bands to take chances.