It all started with the pagan ritual marking summer solstice. In 1976, Joel Cohen – an American musician and expert in French and English renaissance music – hit on the idea of staging an all-night musical celebration to mark the moment the Sun reached its zenith. He pitched his idea to his employers, French radio station France Musique, and six years later in Paris the first Fête de la Musique finally took place. It has since spread so far and wide it’s now known as World Music Day, a time when amateur and professional musicians alike take to the streets to give free concerts across the globe. Here’s our pick of what’s happening across Cambodia during this year’s festival, the theme for which is Urban Sounds: