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John Nastos is a Portland, Oregon–based multi-instrumentalist, composer, educator, and programmer. As a musician, he's toured the world with Grammy winners Diane Schuur and Esperanza Spalding. As a programmer, he created the innovative metronome app Metronomics, which is used by thousands of musicians around the world on iOS, OS X, and Android platforms. More recently, he released a sister app for ear training called Harmonomics. While maintaining a busy performing and teaching schedule, John continues to work on his programming skills and develop new apps.