What does it mean about "hidden" tracks?

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What does it mean when it says that those two tracks were "hidden" before track one? And just out of curiouslity, how would one gain access to those 'hidden' tracks? DonkeyKong64 (Mathematician in training) 19:15, 13 June 2007 (UTC)Reply

See pregap. --PEJL 19:47, 13 June 2007 (UTC)Reply