Dutch independent distribution company Konkurrent oversees the ongoing Fishtank series, in which invited artists are let loose in the studio for two days. Previous sessions have featured Tortoise, Low and Willard Grant Conspiracy, but for the 11th in the series San Diego post-rockers The Black Heart Procession have chosen to work with Dutch prog-rock outfit Solbakken. The result is a magisterial monument to the power of the sustained minor chord, and owes as much to the full-bodied drama of The Bad Seeds as to Mogwai, although closer “Your Cave” approaches the sepulchral splendour of The Triffids.