No, not the shotgun; the columnist. Influential Wall Street Journal tech writer Walt Mossberg explains just how dumb the new Sprint music store is. Case in point: the songs cost $2.50, and are very restricted in use — this compared to Apple’s iTunes Music Store, which has a universal $0.99 price point and fewer use restrictions. Sprint’s songs won’t play on an iPod at all, so we’re sure this is just gonna take the world by storm.