Sakamoto's past works include the Yakuza and Castlevania series, but it was a seventy-five minute long piece for PSP puzzler Echochrome II that make the Guinness World Record boys sit up and take notice The track is called Prime #4507, and you can listen to it below if you have a spare hour or two kicking about. It's rather grand and a lovely piece of music, so dig deep in those time-wallets.