Album art on multiple songs

I have lots of songs in different folders, i.e. I have a folder called 1980's with lots of songs in from different artists.
At the moment I right click on each song and then click Tag Sources > Cover Art > Discogs then pick the cover art.
However, this is very slow.
Is it possible to select all the songs in that 1980's folder and have MP£TAG automatically find and apply the cover art to them all please?

MP3tag works on the basis of an album. So you could assign a picture to all files of an album.
For a selection of tracks from multiple albums, the answer is
In short: no

You would have to use a 3rd party tool like