Thank you @Thomas_Hou for the tip.
It works the way you say.
Maybe I did not understand how to use the app, but I was only able to change the name of the “Album Artist” and the name of the “Album”, as you can see in the screenshot.
I changed “Angela Hewitt” to “Hewitt, Angela” and changed the name of the album by adding “[SACD]” in the end.
I did not find a way to change the name of the composer of all the tracks, unless I change them one by one.
I was also unable to change the “Genre”. I wanted to input “Piano”, but as this is not one of the presets, it was impossible to input it.
If I can make you a suggestion, it will be very useful for this app to be able to change the tag of “Artist”. It’s impossible to display and to change this tag. Such feauture will be useful for compilations, for instance, or for classical music and jazz where there are different collaborators at each track.