Which German-American pianist, conductor, and composer wrote the score for Katharine Hepburn's only stage musical? 
Coco (musical): Coco was a 1969 Broadway musical with a book and lyrics by Alan Jay Lerner and music by André Previn, inspired by the life of Coco Chanel. Coco (musical):  It starred Katharine Hepburn in her only stage musical. André Previn: André George Previn, KBE ( ; born Andreas Ludwig Priwin; April 6, 1929) is a German-American pianist, conductor, and composer.
André Previn