Michael Bublé may seem like a total natural, but the modern crooner based his airy, romantic verve on the greats. There’s some of Chet Baker’s pillowy softness, Tony Bennett’s nuanced phrasing, Frank Sinatra’s deft swing, and Nat “King” Cole’s intimate balladry in nearly everything he does. That’s not all: Tom Jones and Barbra Streisand reminded him to cut loose and be himself, while Peggy Lee confirmed the sultry heat possible at low volumes.