These guys had it sussed.  They played outside the cathedral in Trinidad all day.  They wore a green ‘uniform’ and were on the money with their playing.  The guy, second from the right, sat on a box with half a dozen metal tongs over a sound box.  He played great bass riffs on it looking like he was just sitting there with his hands by his side.  The young guy has some great guitar chops, but whenever he started getting too fancy, the others would give him a look and pull him back in.