This is a quick and dirty GNOME shell extension to show the currently playing song on Spotify in the top bar.
This extension is available for download/installation on the GNOME Extensions Webpage
It is also possible to download it "manually" by cloning the repository to ~/.local/share/gnome-shell/extensions, restarting GNOME and enabling the extension using gnome-shell-extension-tool -e gnomespotifylabel@mheine.github.com. This approach is not recommended, and assumes you know your way around the GNOME Extensions ecosystem.
If you still have issues, talk to me! Create an issue or send me an email; this is my very first GNOME extension, but I'd be happy to help you set it up on your workstation.
The extension is is currently very tailored to my setup, but if you have questions or comments I'd be more than happy to answer them. There are a few configuration options available in the beginning of extension.js, but for more advanced tweaking your best bet is to manually code it.
Have fun!