This can be a rather time-consuming process, since World Tour also gets you to play songs that you have already unlocked, so there is a way to work around this with a cheat code.
Whatever the cheat code does, understand that after you've enabled the code, you are no longer playing the game in the manner that it was intended as sold.
The following are the most popular cheat code websites that devote a large portion of the site to people who are playing the PlayStation 2 game console.
LoveToKnow has several great cheat code articles too!
Do not include the parentheses when entering the cheat code.
