I’ve heard this song at Feel Good Singing. The song that we are referring to is a rendition of “If You’re Happy and You Know It Clap Your Hands “The full song that I’ve heard sounds like this:

“If you clap, when you’re feeling sad. If you clap, when you’re feeling sad. Take it steady. Don’t hurry. And you won’t have time to worry”

In the choir that I attend, we get split into groups, within each group starting to sing at a different time, once we’ve sang it all the way through in our groups, we then swap when to start singing