I was just mucking around the map and I ended up on a rooftop in Rondella during a rainstorm. Suddenly, the DJ Santosi music started playing and it had lyrics. That was a first for me.
After that loops through, it plays the music without lyrics, and then the music from when Mario dances earlier in the game. I figured I should share. Here's my recording of it. It was hasty so it's not the best. I haven't heard anything about this yet, especially the fact that song has lyrics. Anyone know anything else about it? Turning down the sound effects for the rain shut the music off so I left it on.