Notation of Interval Classes
The unordered pitch class interval i (a, b) may be defined as
where i <a, b> is an ordered pitch class interval (Rahn 1980, 28).
While notating unordered intervals with parentheses, as in the example directly above, is perhaps the standard, some theorists, including Robert Morris (1991), prefer to use braces, as in i {a,b}. Both notations are considered acceptable.
Read more about this topic: Interval Class
Famous quotes containing the words interval and/or classes:
“The yearning for an afterlife is the opposite of selfish: it is love and praise for the world that we are privileged, in this complex interval of light, to witness and experience.”
—John Updike (b. 1932)
“Solidity, caution, integrity, efficiency. Lack of imagination, hypocrisy. These qualities characterize the middle classes in every country, but in England they are national characteristics.”
—E.M. (Edward Morgan)