The Piano and Violin Learning Pen from Uxsight is a AAA powered handheld pen shaped device that can read sheet music. Tap the pen over a section of music to hear the music play through the pen. The music can be played at variable speeds and with a metronome to help you learn the sections. The pen is only $20.69, but it’s unknown how much the special music books cost and if they are readily available.
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