We are looking down at the intersection of Av. Juan Escutia and Calle Zamora in Condesa, Mexico City, from a window on the third floor. Normally I'm not that interested in the sound of cars driving by. But this urban soundscape is so remarkably different than the western European one I'm used to!

We hear lots of trucks, big ones, with loud diesel engines, fuelling the air with smog. We hear the typical sound of the green and white Volkswagen Beetles which form the majority of the taxis in Mexico City. And then we hear a melody. A man is selling some sort of corn product down on the street. The melody stops and the man starts to recommend his goods using a megaphone, followed by the same melody. I guess it's lunch time!