STEVIE RAY VAUGHAN & DOUBLE TROUBLE “In Step.” Epic ***: Albums are rated on a scale of one(poor) to five(a classic) stars

As the last big discovery by the late John Hammond, Vaughan rightly dedicates his latest effort to the pioneering record producer and talent scout who died two years ago. Vaughan hopscotches between the blues, jazz and rock that his benefactor mined so successfully in discoveries from Benny Goodman and Billie Holiday to Dylan and Springsteen. Vaughan doesn’t take any quantum leaps beyond the raucous roadhouse blues and rock he has traversed already in three studio albums and one live recording, but he can still set fire to a guitar quicker than you can say “Jack Flash.” The closing tune, “Riviera Paradise,” seems designed to show that Vaughan can shine in low gear as well as overdrive, but the nearly 9-minute, moody excursion waffles between introspective blues and lazy lounge jazz, falling too often on the snoozy side of the street. Mostly, though, it’s blazing business as usual.