We hate to tell you this, kids, but . . . your grandparents invented cool. They really did. Don’t argue. You’ve got Katy Perry and Gah-gah, they had . . . The Rat Pack. Say no more. In episode 7 of Swingtime, we mix the drinks and light the smokes and give you a couple hours of the greatest voices the Sands Hotel ever got slayed by: Frank, Dean and Sammy. Loosen your tie, stay awhile.