With a flurry of Underworld activity on the horizon - the Dubnobasswithmyheadman reissue coming out on October 6, followed by the Royal Festival Hall performance on October 11 - the group have given a taste of one of the extensive extras featured on the re-release in the form of 'Birdstar', a previously unheard demo.

A note accompanying the track from an "official source", explains: "'Birdstar' is a demo from the Dubnobasswithmyheadman period. Many [of] the track's elements were subsequently used in other songs, right up until 'Second Toughest In The Infants', and also utilised in a number of classic Underworld remixes, including Björk's 'Human Behaviour' and 'Black Sky' by Shakespears Sister." Listen above.