O Fortuna topped a 2009 list of the most-played classical music of the previous 75 years in the United Kingdom. O Fortuna "O Fortuna" is a medieval Latin Goliardic poem written early in the 13th century, part of the collection known as the "Carmina Burana". It is a complaint about Fortuna, the inexorable fate that rules both gods and mortals in Roman and Greek mythology. In 1935–36, "O Fortuna" was set to music by German composer Carl Orff as a part of "", the opening and closing movement of his cantata "Carmina Burana". It was first staged by the Frankfurt Opera on
Carmina Burana musical notation that by the time of the manuscript had largely been superseded by staffed neumes. Unheighted neumes only indicate whether a given note is pitched higher or lower than the preceding note, without giving any indication of how much change in pitch there is between two notes, so they are useful only as mnemonic devices for singers who are already familiar with the melody. However, it is possible to identify many of those melodies by comparing them with melodies notated in staffed neumes in other contemporary manuscripts from the schools of Notre Dame and Saint Martial. Between 1935 and