An amateur pop choir that started with a couple dozen singers in a small Serbian town has found unexpected success across the country. Its motto? Anyone can sing.

While community choirs are common in other countries, they are relatively rare in Serbia. The no-stress and fun approach has attracted hundreds of people, mostly women of all ages.

Modeled after similar projects abroad, the choir is encouraging “everyone from 5 to 105” to join and sing for joy and stress relief.

Since starting out in a small town in central Serbia four years ago, Pop Hor has spread to 10 towns across the Balkan country with an ambition to grow further.…