The name's a variation of The Authentic 2008 Experience, coined by JustFlandre, which is an old pirated version of Sonic Adventure DX which replaced all of the music with Windy Valley 1, with the exception of some jingles like invincibility. A few months ago, RobowilOFFICIAL made a mod for SADX which not only replicated the music of the pirated version but also replaced everything else that hadn't been replaced, such as the invincibility theme and the stage end jingle.
What this mod tries to do is take Windy Valley, put it into Sonic 3 and Knuckles, and give it the same treatment that was given to SADX. Now, enjoy the serene music of Windy Valley and hope that it doesn't get old. Because it never will, never! MUAHAHAHAHA