Tricky Business is a song in LittleBigPlanet obtained by doing a two player challenge in the level Sensei's Lost Castle.
You can obtain it by swinging up after the drop down. You can easily identify it by the "x2 player" sign. One player (above) must hop across pits of spikes while a second player (bottom) must move a sponge ball with a magnetic key on it to raise some shurikens so the first player can move through. At the end are the prize bubbles.