Mike,
That's been around for several years now, The PSR9k has a video interface built in, the PA80 offers it as an option, and Roland makes a box that you can add on that supplies video out. A better solution is to use a laptop on a stand in front of you both. You get a bright, clear display - lots of info, lead sheets, chord charts, whatever.
There are also software SMF playback programs that blow the doors off anything inside a keyboard. The future is here, and it's affordable, and portable too !
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