Robbie Williams is out here doing the promo rounds the fun way, popping up on the streets to treat fans before his proper arena gigs begin. This is the kind of thing that reminds you why people still get excited about pop stars, even after two decades away from a place. If you're heading to Buenos Aires in the coming weeks, looks like you might want to keep your eyes peeled around street corners. It's a nice bit of theatre from someone who clearly remembers how to keep people talking.