Tony Bennett's half-century career, celebrated on this majestic five-disc set, is a wonder of consistency and vocal excellence. Bennett began his tenure at Columbia in the early 1950s with an impressively powerful and emotive voice that, over the years, richened into a gorgeous instrument capable of the most penetrating expressiveness. Decades after his initial hit-making days -- all documented here --Bennett continued evolving as an artist. Just listen to his more recent work from the past decade to hear how much deeper this vocal genius has taken his song readings. If the soaring notes of his youth aren't as audible anymore, Bennett's moving sensitivity to a lyric, superb phrasing, and unvarnished swing more than makes up for any technical failings. But the mature years are only a segment of this radiant retrospective; the majority of the set centers on the classics that established and fortified Bennett's fame, including such signature performances as "I Wanna Be Around," "Stranger in Paradise," "Once Upon a Time," and, of course, "I Left My Heart in San Francisco." Yet those who are most familiar with Bennett's theme songs will also be blown away by his soaring interpretations of songs associated with Frank Sinatra, Billie Holiday, Fred Astaire, and others that were originally found in Bennett's highly acclaimed tribute albums. Sinatra may reign as America's numero uno popular singer, but, as this glorious collection proves, Bennett has been, and remains, his only true heir.