We have added many modules to the polybar. Every now and again creative people will make new modules and you will find the configuration online.
Our intention is to share the knowledge how you can add them to your system. It is not our attention to have all modules out there in the config.
This particular module uses zscroll-git so install that package if you want to install this new module spotify2.
sudo pacman -S zscroll-git
Showcase of the module