Cheats for Donkey Kong Country

SOUND TEST
'Darby Day Code' Before starting a new game, go to the Game Select screen and highlight the 'Erase Data' option. Press Down, A, R, B, Y, Down, A, and Y. If you enter the code correctly, you can change the music by pressing Select. 
PRACTICE BONUS GAMES
'Diddy Code' Select a saved file. Go into any area that you've completed and lose all of your lives, then press any button to get off the 'Game Over' screen. As soon as you see Cranky Kong on the screen press, Down, Y, Down, Down, Y. If done properly, you will go into an area where you can pick up three of any of the animal statues so that you can load up on extra lives in your choice of Bonus Stage. To keep the lives you collect here and resume your saved game, simply press Start to pause, then Select to exit this bonus area.
50 LIVES
'Barral Code' Before starting game, go to the Game Select screen and highlight the 'Erase Data' option. Now press B, A, R, R, A, L. Then select a file and start playing. Caution! If the 'Erase Game' option is flashing after you've entered the code, then the erase option is active and you'll erase whichever file you select. Press Reset and try the code again.