What do you think is going on in this picture?

Children circle around an ultraviolet lamp to get a dose of vitamin D in Murmansk, Union of Soviet Socialist Republics, August 1977.

How to ride the Paris Metro

1. Buy a ticket

How to ride the Paris Metro

2. Put your ticket in the turnstile

How to ride the Paris Metro

3. Find the correct track

How to ride the Paris Metro

4. Pass a street musician.

How to ride the Paris Metro

5. Get on the train.

How to ride the Paris metro

6. Know your stop.

Paris Metro Fast Facts

5 million passengers a day

303 stations

Miles and miles of empty hallways

Paris Metro MusiciansNot anyone can perform in the metro

300 permits given a year

2,000 groups audition for the 300 permits

Mr. Naso is an artistic director for the Paris Métro.

Paris Metro Musicians

Musicans judged by Mr. Naso, two Métro employees and two members of the public

Producers and record houses scout the metro

Several groups have become famous. For example: rock musician Ben Harper

Paris Metro Muscians

Two types: musicians with permits and musicians who hop on train to perform

Paris Metro Musicians Video

http://www.nytimes.com/2013/11/06/world/europe/trying-to-elevate-the-sounds-competing-with-subterranean-clatter.html?ref=international-home&_r=0