PBS's signature performing-arts series showcases dance, drama, comedy and music ranging from orchestral and operatic to Broadway and the blues. The Lanford Wilson drama 'The Rimers of Eldritch' was its first presentation and 'Brideshead Revisited' was perhaps its most famous. There have been more than 600 'Great Performances' all told. Some might have been only 'reasonable performances' (as Robin Williams once quipped), but many others were distinguished, among them some 50 Emmy nominees.