Incest Songs is the final chapter of the Murder Ballads trilogy, and its most fully realized expression. Where Drift and Passages explored the post-isolationist frame through voice and single instrument, this third volume dispenses with that approach entirely, opening instead onto a more labyrinthine sonic architecture - one built from overlapping, saturating, blurring voices, all of them Martyn Bates'. The decision feels both inevitable and quietly inspired. Bates' vocalizations unfold as layered calls and responses, muted and distant echoes, sung whispers and counter-melodies, ultimately resolving into a mesmeric conversation of musical inferences and correspondences. There is a mellifluous, dream-like quality to the whole - infused with that characteristic stillness that slow, hypnotic unfolding of gossamer subtlety - yet never quite losing a certain drugged, disquieting beauty beneath its surface.

Incest Songs pushes the post-isolationist form further out than either of its predecessors, innovating and extemporising with a dazzling assurance. And yet, remarkably, this remains a territory still almost entirely unexplored by other artists - the sole province, it seems, of M.J. Harris and Martyn Bates.

As Bates himself reflects: "I feel, in personal terms listening to it, I think it's easy to detect that the whole thing has been a truly exhilarating experience for the both of us, realising and developing this strange, sublime creature of ours and now I guess it's up to others to take up the challenge, to build on what we've done and I think that there are still SO MANY fantastic possibilities "