The relative pitches of individual notes in a scale may be determined by one of a number of tuning systems. In the west, the twelve-note chromatic scale is the most common method of organization, with equal temperament now the most widely used method of tuning that scale. In it, the pitch ratio between any two successive notes of the scale is exactly the twelfth root of two (or about 1.05946). In well-tempered systems (as used in the time of Johann Sebastian Bach, for example), different methods of musical tuning were used. Almost all of these systems have one interval in common, the octave, where the pitch of one note is double the frequency of another. For example, if the A above middle C is 440 Hz, the A an octave above that is 880 Hz (info).
What is the most common method of organization?
twelve-note chromatic scale

The College of Arts and Letters was established as the university's first college in 1842 with the first degrees given in 1849. The university's first academic curriculum was modeled after the Jesuit Ratio Studiorum from Saint Louis University. Today the college, housed in O'Shaughnessy Hall, includes 20 departments in the areas of fine arts, humanities, and social sciences, and awards Bachelor of Arts (B.A.) degrees in 33 majors, making it the largest of the university's colleges. There are around 2,500 undergraduates and 750 graduates enrolled in the college.
In what year was the The College of Arts and Letters at Notre Dame created?
1842

In the 1990s two icons by the Russian icon painter Sergei Fyodorov were hung in the abbey. On 6 September 1997 the funeral of Diana, Princess of Wales, was held at the Abbey. On 17 September 2010 Pope Benedict XVI became the first pope to set foot in the abbey.
Who was the first pope to set foot in the abbey?
Pope Benedict XVI