Bard’s next chamber concert, Program Eight, “The Pinnacle of Achievement,” celebrates the music of Mozart and Joseph Haydn, when both were in their prime. Featured works include Mozart’s String Quintet in G minor, a profound, dark-hued masterpiece, written during his father’s final illness; several of Mozart’s finest lieder; and his Piano Concerto No. 24 in C minor, perhaps the greatest of his concertos, in the chamber arrangement to which he gave his blessing, by his student Johann Nepomuk Hummel. Known for good reason as the “Father of the String Quartet,” the elder Haydn brother is represented by the third of his “Russian” quartets, a mature work nicknamed “The Joke,” and perhaps one of those that inspired the six that Mozart dedicated to him.