Jazz pianist and singer Diana Krall’s most recent studio album is the early-2015 release “Wallflower,” an exploration of, mostly, soft-rock hits from the 1970s — indeed, the golden age of soft rock.

STATEN ISLAND, N.Y. — If you’re in the mood for the sophisticated sounds of swing and the silky-smooth sounds of jazz, the era of elegance will come to life at the St. George Theatre when Alex Leonard ...