Summer has arrived and on the longest day of the year, it means the return of Fete de la Musique.

On June 21, musicians of all styles are bringing their sounds to the sidewalks, parks, bistros and even music venues around the world, and it's Free.

The theme chosen by Fete de la Musique 2012 is Celebrate 50 Years of Pop.

Why? Because of a little fact they remind us of:

"In 1962, four lads from Liverpool released their first EP…The Beatles marked the dawn of a new era with Love Me Do: Pop music was born.

Like jazz music, pop caused a musical revolution which transformed our society.

On Thursday June 21st, music lovers, amateur and professional musicians, have been invited to celebrate pop in all its forms on the streets !"

Not every city follows the pop theme, Make Music in New York has many strands from Punk to Gospel to a premiere of a mass by Philip Glass.

I will cover some of the NY programs in a separate piece.

To find out what's happening in your corner of the world, you can check the Program from Argentina to Zambia.

In Madras (India) festivities run from June 21 to June 26 and take place either at Alliance Francaise or Goethe Institute.

London where event goes under the name Exhibition Road Music Day waits until Saturday, June 23 to join the fray.