I think there are mainly two competitors in Norway. The oldest and most recognisable is Isbilen (recently rebranded to Fråst) which plays Norwegian dance no. 2 by Edvard Grieg https://youtu.be/GFQLAVpataA

Diplom-isbilen is a lot newer, however lately i have mostly been hearing them driving around. https://youtu.be/6xXp-11Swcc

Hjem-is no longer operates in Norway, but they used to just ring a bell. I think they’re still around in Sweden under the name Hemglass