Though he rose to prominence at the helm of a traditional jazz piano trio, in recent years Brad Mehldau has proved himself a master of the duo format via outside-the-box encounters with drummer Mark Guiliana, mandolinist Chris Thile and others. Expect unadulterated elegance here, as the piano star goes toe-to-toe with bass master Christian McBride, Mehldau's bandmate in Joshua Redman's celebrated early-’90s quartet.