I adore their music!
Atm the knife doens’t excist anymore… Singer Karin Dreijer Andersson has her own project now, which is called Fever Ray.. 
The songs of Fever Ray are really amazing as well
Karin Dreijer Andersson
The Knife
Karin Dreijer Andersson
Some of their music:
The Knife – Kino:

The Knife – Marble House:

The Knife – Got 2 Let u

The Knife – One Hit:

Fever ray – When I grow up:

Röyksopp (with vocals by Karin Dreijer Andersson) – What else is there?:

The Knife – Bird:

The Knife – Heartbeats

The Knife – You Take My Breath Away

The Knife – You Make Me Feel Like Charity:

The Knife – We Share Our Mother’s Health: