First, connect an extra joystick in the Famicom's expansion port. At the title screen, press Up-Right in the extra joystick and Down-Left in controller 1 at the same time. (If you can find a way of pressing all 4 crosspad buttons on controller 1, then you don't need the extra joystick). If done right, you'll hear a sound. Now, hold either Right, Left, Up, Left + Select, Right-Down, Left-Down, Up-Left or Up-Right controller 1 and press A on controller 2 to hear the different music and sound effects.