I do not know, but it is available to download via the PSN store as of now.
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You cannot unlock it for PS2. It was a free downloadable song for Xbox 360 and PS3, meaning PS2 users cannot get it.
Koji Kondo created the Super Mario Bros. theme song.
Most probably "Song creator" or "Create custom song"
south park theme song
THe legend of Zelda theme song was created by Shigeru Miyamoto.