JoyTunes creates apps that allow people to teach themselves to play music but they've also become a favorite of many teachers who encourage their students to use the apps to support practicing. Their apps generate revenue through paid accounts and in-app purchases. Recently JoyTunes completed a $5 million Series A round and, in what sounds partly like a leap of faith, are now giving registered teachers and their students free access to Piano Maestro. CEO and Co-founder Yuval Kaminka says it's a move to partner with teachers and grow the larger digital music learning pie. JoyTunes currently features two iOS...

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