The Knife is a brother and sister duo from Sweden consisting of Karin and Olof. I'm going to throw some descriptions of their music out (this is a bit unfair but for analogy purposes)- dark electro pop, rhythm and dream pop.
Their whole shtick is dressing up in costumes so that they don't let their looks detract from the experience of listening to their music. They choose what masks they wear to embody what their music sounds like. Their videos are fascinating in that they have to represent the band's persona and never feature the members themselves. As a result, there is usually disturbing imagery and the director's interpretation of the Knife's songs.
You May have heard Jose Gonzalez's cover of the Knife's track "Heartbeats". What's interesting is that the cover sounds like an original track- Gonzales's goes as far to mimic Karin's vocal style but change the electronic sounds to one that only uses an acoustic guitar.
Listen to:
Heartbeats
We Share Our Mother's Health
Silent Shout
Pass This On
Marble House
The Knife is one of those bands like Bjork who really know how to use the music video.
Videos:
The video for "We share our mother's health" directed by Motomichi Nakamura looks similar to Chiho Aoshima's work.
Click to view
Marble House:
Click to view
Thanks to michelle for the rec!