Found a link to this in Popbitch: http://www.schlagerparty.co.uk/

From the site blurb:

Schlager music in modern terms is the genre of music that is best described as ‘Abba-esque'. Coming from the German word for "hitter" or a music "hit", it describes modern traditional pop music, predominantly from Scandinavia. Most schlager fans will point towards the Swedish Eurovision Song Contest selection show, ‘Melodifestivalen', as the annual source of the best schlager music but many songs in the running to represent Norway, Denmark, Finland, Iceland, and recently Estonia and Latvia are included.

I had never, ever heard of this before.