Whether you are just a beginner or a seasoned musician this program allows you to practice the fundamental skill of hearing the difference between minor and major keys. This program randomly selects a chord and plays it with adjustable speed. Your task is to decide whether this is a minor or major chord. Alternatively, only two sounds are played and your task is to tell the difference between full step or half step. You are in charge of selecting octaves from which sounds are selected. To measure your performance over time the history of your scores can be visualized in a graph.