Some more from Sweden...
E-Type: eurodance
Meja: Pop, pop rock, jazz
September: Pop Eurodance dance-pop Europop electronic
West End Girls: synthpop/cover, and if you have played The Sims 2 you might recognize them
The Attic: Pop, techno
Lazee: Hip-hop | Apollo Drive: Pop/rock
Neverstore: Pop-punk/rockband