A parade based on classic Disney music? What a great idea!
And that parade already exists, and I could easily see it heading out to WDW about 18 months from now.
Mickey's Soundsational Parade debuted at Disneyland in 2011, and is heavily rumored to be replaced in 18 months with a new parade for Disneyland's 60th Anniversary celebration in 2015. The Soundsational Parade is fabulous with a 15+ minute run time, with splashy floats, fun effects, live musicians playing favorite Disney songs (including Mickey himself on drums), and a fresh aesthetic quality to it all that definitely looks like it's from the 2010's instead of the 1990's.
I could see that parade working quite nicely in DHS. Or, Magic Kingdom Park. And it will be available for the move to Florida by late 2014.
What also can't be forgotten is that DCA's Pixar Play Parade is also up for retirement from Anaheim. So that's an option for WDW too.