In honor of the 90th birthday of Stephen Sondheim, concert pianist Anthony de Mare has expanded his acclaimed project, Liaisons, for which he commissioned 36 leading composers from the worlds of classical, jazz, film, pop and musical theater to “re-imagine” one of Sondheim’s songs as a solo piano piece. The addition of 14 new composers, including Jon Batiste, Meredith Monk ,and Timo Andres, creates a remarkable compendium of new music that breaks open the boundaries between musical theater and concert music.