In September 1965, he premiered the first of his Sacred Concerts. He created a jazz Christian liturgy. Although the work received mixed reviews, Ellington was proud of the composition and performed it dozens of times. This concert was followed by two others of the same type in 1968 and 1973, known as the Second and Third Sacred Concerts. These generated controversy in what was already a tumultuous time in the United States. Many saw the Sacred Music suites as an attempt to reinforce commercial support for organized religion, though Ellington simply said it was "the most important thing I've done". The Steinway piano upon which the Sacred Concerts were composed is part of the collection of the Smithsonian's National Museum of American History. Like Haydn and Mozart, Ellington conducted his orchestra from the piano – he always played the keyboard parts when the Sacred Concerts were performed.