Cantata is missing icons in Solus. Specifically the menu items and items for shuffle at the status bar.
I am not sure why, since fontawesome is installed. It affects Solus Budgie as well as the Plasma ISO.
As a reference what it should look like: https://github.com/cdrummond/cantata and https://www.linux-apps.com/p/1126635/
See my screnshot: https://imgur.com/a/gyGbh