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+---- Thread: Sweet Mountain's Map Theme in Colours is Remixed from a Past Sonic Stage (/thread-1951.html)
Sweet Mountain's Map Theme in Colours is Remixed from a Past Sonic Stage - CuriousUserX90 - 09-09-2014
This has been mentioned in various places (in the comments of Youtube Videos, and mentioned elsewhere) that the Music which plays on the Map in Sweet Mountain in Sonic Colours is actually a Remix from (or Based off or Similar in General) Red Mountain's A Symbol of Thrill Track from Sonic Adventure. I even listened to the music myself after hearing this, and was amazed. Have a listen:
Sweet Mountain Map in Sonic Colours (more specifically at 0:42)
Red Mountain in Sonic Adventure (more specifically at 0:15)
To further support this, Trivia Sections of Sites have also mentioned it: http://sonic.wikia.com/wiki/Sweet_Mountain#Trivia