Another vote for Silver Train. I was gutted not to get it in Macau (Got GOMC instead- again!). I have heard the version they did in Tokyo and it's awesome - can't believe they only did it the one time! (So far). Sometimes they do these 'dream songs' and they can come off a bit tentative (Sway being an example IMO) - but from the Japan version I heard, it was smoking full steam ahead!
Silver Train would be great but I wouldn't count on MT playing, unfortunately. We're lucky to get him on Satisfaction and I think it's just to have him on for the final stage bow.