The phrase zdravstvuyte rebyata is a common Russian way to greet a group of children, roughly equivalent to hello, everyone, and nu adds a friendly well then at the front. Clips of musical greetings like this circulate on soundboards as short excerpts, often labelled simply as a fragment of a greeting song rather than a full track. Because the wording is instantly recognisable to Russian speakers, the excerpt works out of context as a standalone welcome, which is why editors reuse it for intros, classroom content and light hearted meme openings online.