Okay, you can do that from GNOME Tweak Tool with a single click, but thats the CLI alternative :)
Dont forget to check on the fantastic Systemd Manager App, made with Rust and GTK!
https://github.com/mmstick/systemd-ma...
G+ reference
https://plus.google.com/+WorldofGnome...
Music
Craves - By My Side
Wallpaper
https://www.flickr.com/photos/1370827...
I dont know the original sources of wallpapers I'm using, so if anyone is author, please give the original link!