I often do a two-song medley of La Bamba and Twist and Shout. There are many others you could throw in with the same style, assuming you are playing versus using midi files. Maybe Crocodile Rock, Land of 1000 Dances (Hey it's only ONE chord!) Speaking of one-chord songs, Bo Diddly would work if you have the right beat. It's on a lot of Yamaha arrangers.
DonM
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DonM