Yannick celebrates two toweringly gifted composers, seminal American voices of the 20th century. Gershwin’s Piano Concerto dances through cityscapes, brash and brilliant. Bernstein, whose works for the concert hall, opera stage, Broadway, and film formed the soundtrack of the century, is represented by his Broadway masterwork West Side Story, and his impassioned “Jeremiah” Symphony, an epic chronicle of a prophet and a people.