There are 9 MIDI files for you to hear. Work out which pieces are Ground Bass examples.
You may need to drag your MIDI player to a convenient place or minimize it. You may also wish to press F11 for a full screen.
You do not have to listen to the whole of each extract, you can answer as soon as you like and move on to the next piece. [You should not need to click 'stop' on your midi player to move on to the next example.]