On the Option screen, choose Hard Mode, then select "STAFF" in the sound test. Push B to hear the tune, then tap Y for a special version of the song.
At the title screen, press Up, Up, Down, Down, Left, Right, B, A on Controller Two. Next, go to the Options screen and use Controller One to increase your lives up to 10.
At the title screen, press Up, Up, Down, Down, Left, Right, Left, Right, L, R on Controller Two.