After you play Rock The Blues - easy one note tune, you may try this one.
It's easy, count till 4, then play a D (press pistons 1 and 3), a C (release all pistons) and a D again. Like this:
For more details, follow this forum thread:
You are free to copy, distribute and transmit this work under the following conditions:
*Please contact me if you would like to use this in a commercial project. We can discuss the details.