Well, actually, Donkey Konga is not a bongo game, but a conga game. Hence the name. Duh.
Basically, there's a pair of congo drums as a controller, with a mike built in. On the screen, a certain color means hit the right drum, another color means hit the left drum, another means to clap (the mike senses it), another means to hit them at the same time, another means to give a drumroll starting with the right hand, another says to give a drumroll start with the left hand, another says to clap your hands off...there's infinite amount of possibilities, and it's basically DDR. Except you can't use this one as a replacment for the dusty treadmill.