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PCN (Pitch Class Processor, in Portuguese) is a program designed to help analysis based on set theory, effecting all (I hope) basic operations. It was developed as an example of the use of a object-oriented library named objnota. This library was the result of a project sponsored by the National Council for the Scientific and Technological Development (CNPq).

The interface of PCN consists of two windows. The main window has the keyboard and the processor windows, and the secondary window (Output window) has the data to be saved or printed.

This program is freeware. Please, if you use it donít forget the credits to Jamary Oliveira.

Any doubts, uses, bugs, and suggestions I will be happy to know about. Send an e-mail to,