Nifty. Say, I recently heard the 600 A.D. overworld theme from Chrono Trigger on WTMK. I'm not complaining, but was it for any particular reason?
I can't imagine why it would have been -- do you remember the track name or anything like that?
There are a few medley tracks, which often mix Mario tunes with those from other games, but it's always possible something went wrong on the server...
Edit: You probably heard "Beware the Outer Wall Windmill's Z Blocks (circa 600 A.D.)" - it's a remix medley track with music from Super Mario RPG, Chrono Trigger, and a few other games, and it's from the March 2010 Dwelling of the Duels competition.