Mark Christian Miller by turns suave, touching at the Gardenia

“It’s really a downer!” admitted cabaret singer Mark Christian Miller, half-smiling, in genial patter during his tight and artful set of jazz standards and high seventies pop at Hollywood’s Gardenia Restaurant & Lounge Saturday night. “Is there anybody else here? It’s cold and I’m so lonely,” runs the plaintive lyric of Harry Nilsson’s “Life Line,” ...