Same in Prague (first Wednesday of each month). I've been on calls for work the past couple times, people always ask me what the background noise is. Here it's

Same in Prague (first Wednesday of each month). I've been on calls for work the past couple times, people always ask me what the background noise is. Here it's a siren, and then a spoken message (in Czech and then in English) telling people the emergency broadcast system is being tested. It goes on for a good 5 minutes. At the start of the lockdown they blasted this [1] children's song over the broadcast system to try cheer everyone up [1] https://www.youtube.com/watch?v=9YWcQRKNyjM https://www.youtube.com/watch?v=9YWcQRKNyjM