They're a band from NY fronted by sisters Jessica and Cristi Jo. They've got an EP coming out in November which is apparently their debut but there is some stuff available online, and they frequently join Hooray for Earth on stage.
them live;
http://www.vimeo.com/27390449
http://www.vimeo.com/17893738
http://www.youtube.com/watch?v=60WNruOutIg&feature=email
Trailer for their EP, Glossolalia;
http://www.vimeo.com/26099268
Their website is zambri.net
Photo credit http://maryanneventrice.wordpress.com/2010/09/16/gallery-twin-shadow-zambri-my-gold-mask/

http://www.vimeo.com/27390449
http://www.vimeo.com/17893738
http://www.youtube.com/watch?v=60WNruOutIg&feature=email
Trailer for their EP, Glossolalia;
http://www.vimeo.com/26099268
Their website is zambri.net
Photo credit http://maryanneventrice.wordpress.com/2010/09/16/gallery-twin-shadow-zambri-my-gold-mask/