Dosing its rootsy rock and roll with a shot of country and etheral, melodic pop Milwaukee's Great Lake Drifters have created a sound that is difficult to pin down. With a brand new CD, " Radio Picture Show," the band takes part in this weekend's Equinox Music Festival at Linneman's in Riverwest. We chatted with a couple of the band's members about GLD, about "Radio Picture Show" and about Equinox.