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RPitch is a small, handy feature-rich relative pitch ear training application. It's written in Java and uses the javax.sound.midi API to generate MIDI audio.

"Relative pitch" is the ability to recognize and name an interval (the distance between two musical notes) simply by hearing it. Unlike perfect pitch, which many claim cannot by acquired through training or practice, most people can attain a reasonably well-developed sense of relative pitch through practice and repeated drills.