saw Diana Krall's Summer's Night concert. Heavily jazz instrument based. Krall on piano and side drums, bass and guitar.
All but two songs featured riffs by each player and a couple had two rounds. Krall's voice was not featured.
singers sometimes do that when their voice isn't where they want it to be. Fortunately, Krall can play, and her band is topnotch
Anthony Wilson (who is usually playing guitar with her) is one of the best in the biz