Tango lesson - in the Metro!

One Thursday a month, the Paris Metro holds a dance lesson at the Mitterand Library station: rock, hip-hop, tango...  Today was tango.  A musician played a couple of pieces, then 3 couples danced a couple of demonstrations, and then whoever wanted to joined them for a lesson, right in the hall of the metro station.  It was great!  You can see the enthousiasm and concentration in the faces of those, learning the first slide-step of the tango.