What is "hadestown"

Hadestown is the fourth album by Vermont-based Anaïs Mitchell, and was released by Righteous Babe Records in the U.S. on March 9, 2010. The album, a concept album, follows a variation on the Ancient Greek myth of Orpheus and Eurydice, where Orpheus must embark on a quest to rescue his wife Eurydice from the underworld. It has been advertised as a 'folk opera'. Several of the songs feature singers other than Mitchell, including Justin Vernon (better known as lead vocalist and guitarist of Wisconsin-based band Bon Iver), Ani DiFranco, Greg Brown, and Tanya, Petra and Rachel Haden (referred to in the track listing as 'The Haden Triplets').