In the "hints" section someone tells you the
real way to get Wario Karaoke. I'll tell you the
cheat to get it. Go to the Sound Room. Put the
little hand over the "Exit" sign. This is the hard
part. With the hand on the "Exit" sign press
Start, Select, Up on direction pad, L, and R at
the SAME TIME. I recomend turning the
gameboy sideways so that the side with start,
select, and the direction pad are facing you.
Press start and select both with your right
thumb. Press Up with your left thumb. Press R
with your left index finger and L with your left
pinkie. It might take a few tries to get it down.
When you do it right a sign saying karaoke will
pop up next to the exit sign. Move the hand
over it and press A to play it.