Violinists often turn to the Bach partitas when making a solo CD, and Koh doesn't buck the trend. Where she distinguishes herself is in the playing -- particularly in No. 3, which closes this album (check the "Ciaccona"). The inclusion of a Saariaho piece fulfills the "beyond Bach" rubric, and it's well done. Even better is "Dissolve, O My Heart," by Missy Mazzoli, in which the gravity is cut with the occasional spirited figure. It's enough to make you forgive the snoozer choice of Ysaÿe's sonatas, which are well played, but aren't of much compositional interest outside their Bach connection.