Do a google search for album-art and allow you to save in the rhythmbox cache/song folder or your Music folder
Graphical equalizer
Installation instructions:
git clone https://github.com/luqmana/rhythmbox-plugins.git cd rhythmbox-plugins/equalizer
For debian and debian based systems such as Ubuntu and Linux Mint:
sudo apt-get install gir1.2-gconf-2.0 python-lxml
For rhythmbox v2.96 - 2.98:
./install.sh
Enable the equalizer plugin in Edit - Plugins - Equalizer
For rhythmbox v2.99:
./install.sh
Enable the equalizer plugin in the app menu - Plugins - Equalizer
For rhythmbox v3.0 and later:
./install.sh --rb3
Enable the equalizer plugin in the app menu - Plugins - Equalizer
Right-click option to open the song folder where the selected folder is saved
See the individual plugins for further information.