I'll never forget the first time I heard this song as a child in the 90s. My parents and my moms sister loved Bjork. Glad I grew up with it.

oh man this is the Mugler Alien goddess perfume theme track..

Björk : the queen of electronic music...

1. Stonemilker

Crisis

Björk
Unison 
Royal Opera House
16 / 12 / 2001

Undo is part of the Vespertine album.
Written and Produced Jan/March 2000 by Bjørk and Thomas Knak.
Released by One Little Indian in 2001.