Quinze són quinze

Quinze són quinze és una cançó-joc.
El joc consisteix a fer ratlletes tot cantant, si segueixes bé la pulsació te’n sortiran 15 tal com diu

The title mean 'fifteen are fifteen'.
It's a children's game based on the song. You have to draw lines while singing. At the end you'll have 15 lines as the song says.