Sisters, Sierra and Bianca Casady, also known as CocoRosie, have unleashed a track, 'Gravediggress', from their new studio album, 'Tales Of A Grass Widow'.

Their fifth album will be released on May 27 on City Slang Records in the UK and Europe, and May 28 in America.

The sisters will launch 'Girls Against God' - an arts and letters print publication, in this, their tenth year as CocoRosie.  Linked to this project, the Casady sisters have founded the Future Feminists with Antony Hegarty and performance artists Kembra Pfahler and Johanna Constantine.  The group's platform is to "free society and protect the planet from the corrosive effects of patriarchal belief systems".

This spring the duo unveil their work on a production of "Peter Pan" by the Berliner Ensemble along with theatre director Robert Wilson, and will be performing in Paris under the curation of Laurie Anderson.

Gravediggress by CocoRosie

Watch CocoRosie take part in Antony Hegarty's Meltdown Festival at London's Southbank below: