The introduction is an essay on the special nature of Mozart's genius. Erich Hartzmann leads us into the composer's workshop; Edward E. Lowinsky and Hans T. David analyze his rhythm and harmony; Nathan Broder describes the instrument for which the piano works were written; Ernst Fritz Schmid contrasts Mozrt's personality and output with those of his friend and older contemporary, Haydn; Friedrich Blume unravels the tangled skein of the creation of the requiem; Frederick W. Sternfeld establishes the relationship between Papageno's song and Bach's motet Singet dem Herren ein neues lied; Nathan Broder assesses A. E. Muller's Guide to the accurate performance of Mozartean Piano Concertos; and Otto Erich Deutsch investigates the errors and fallacies in Mozart biography.