You may think you know Tony Bennett's signature approach to crooning, but his cool, collected voice flexes its range across a diverse run of collaborations. He quivers alongside k.d. lang for a sumptuous, string-swathed duet on “What a Wonderful World” and playfully swings against Count Basie on a 1990 remix of “Are You Havin' Any Fun?” And Bennett digs especially deep when teaming up with jazz pianist Bill Evans on the emotional “Waltz for Debby”.