In the Paris Metro, music fills the air as talented musicians serenade passengers rushing to catch their trains. These performers are not just random street artists—they are part of a long tradition that dates back to the early days of the metro itself.Music in the Paris Metro has been around since the 1970s. At first, anyone could play in the stations or inside the trains. But as more musicians showed up, the metro authorities decided to organize things a bit. In 1997, the RATP (the company tha