Cover art

A fast way to get album art is to select an album and use Cover art > get from the internet.
However, the bulk of my collection is classical and this is not really the stronghold of the YADB, the online database.

Google Image Search

An alternative is to use Google Image.
MC uses the artist as a default search criteria, this results in far too many hits.
Image search opens in the same tab as where I have my album view so you loose the position of the album and has to use the back button as often as you have been opening a new page to go back to the album list.

 

The behavior of the links is fully configurable.
Right click on the Image link and choose customize

This is the default

 

Replace the [search] by the fields you need, in my case [album] [album artist]
Action: Choose open in a new tab
Say goodbye to RSI and thanks to Mr ChriZ for the tip.