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.