Ok, so we all know the three kings, but who were these kids that knocked on my door on Monday? I simply opened and out they burst with this song (which lasted almost 5 mins). I found out that giving them something sweet was common, so in they came. I couldn't get rid of them for an hour, they ate and drank all my pepsi and bon bons! What is this...it isn't the three kings wanting money!
Maybe reading about Easter Monday on the page Culture - Easter in the Czech Republic would help answer your question...
I had read that first, to no avail... Maybe they were just 3 wiseguys, eh? Naw, I remember this from last year also...