A master bartender stands behind the stick at the blandly named Jazz Lounge of Bar UnCommon. Chris McMillian, the long-time mixologist at the Ritz-Carlton’s now defunct Library Lounge, has a worldwide reputation for his deep knowledge of classic cocktails. His new home is modern and high design, with glittering alcoves holdings his bottles and silver mint-julep cups. Cocktail connoisseurs never stray from the bar, hoping to glean tips from the master. Hotel guests prefer to lounge on the couches under a sea of blown glass bulbs suspended from the ceiling.