I'm currently experimenting with de-mixing technology to make a upmixed version of SMiLE, the results are interesting, albeit, experimental. (Don't worry, the videos are just 15 sec long, I don't think there's a problem on uploading snippets)
https://www.youtube.com/watch?v=OO2K2-4GT6AFor example, this Barnyard one, which has the drums, organ and animal noises centered, instruments left and backing vocals right.
https://www.youtube.com/watch?v=x-emy2NioEcOr this one of Gee, which basically plays with the panning of one of the many layers of vocals
https://www.youtube.com/watch?v=Vl9fQV3-Fn8Other thing i'm very proud of: Separating the instruments of the Bicycle Rider Theme
I hope you enjoy it!