Composer Philip Glass and director Robert Wilson's Einstein on the Beach, widely credited as one of the greatest artistic achievements of the 20th century, launched its creators to international success when it was first produced in Avignon, France, in 1976, with subsequent performances in Europe and in New York at the Metropolitan Opera. It is still recognized as one of their greatest masterpieces. Now, nearly four decades after it was first performed and 20 years since its last production, Ein…