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 the 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.”