Ida Maria's "Oh My God" is THE song of summer, for freaking out on the dance floor, blasting in the car with the windows down, and playing on repeat when you can't find a job and you just need a cure for your life.
Ida Maria is by no means underground at this point. Her (really awesome) video for "I Like You So Much Better When You're Naked" has over 1 mill views. But the whole "Fortress Around My Heart" album is really great and deserving of fanhood.
http://www.theelectors.com/2009/06/10/a-cure-for-my-life-ida-maria/
