The Clash to release 12-disc ‘Sound System’ box set, new 2CD best-of this September

The Clash return to record stores in a big way this September, with the release of a 12-disc box set called Sound System — featuring five of the band’s six albums, a DVD with unseen footage and three discs’ worth of demos, non-album singles, rarities and B-sides — as well as a new double-disc best-of set.