There were plenty of them around back in the seventies. They were home "toys" for people who either didn't play or coudn't. The theory behind them was you could learn to pick out favorite melodies with your right hand and play the accompanying chords with your left. I haven't seen one of them in years.
This one works. So how do you know which chords to use?
Here's a routine reminder: Avoid flames: critique principles, not people. Be discriminating but don't nitpick. Be academic not acerbic. Be principled not polemical.
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