How to match Artists & Albums with Volumio database


I got issues with some artists and albums covers that are not matching Volumio databse
Probably because of a name spell : For example, Alabama shakes’ album “Sound & Color” has no cover art while it has one tage inside the files.
I guess, volumio is not finding the album name because of the “&”, but how to be sure ? What database volumio is using to grab the artist image and album image
I gotbthe same problem for several artist images

I haven’t found the info neither in the doc nor in the forum.

Many thanks

according to a bug showing me a last fm logo, i have checked and found album artist pictures are matched with last fm