Given that the dominant emotional state for many has been one of claustrophobia, it’s not surprising that this has been reflected in some of this year’s musical releases. ‘Tunnel Sound’ is the name Kevin Martin, better known as The Bug, and US-born, Berlin-based singer Felicia Chen aka Dis Fig have given to describe the mood of their dense and murky new album In Blue. Tunnels, by definition, are places of restriction, places where light is mostly absent and the human body must adjust to reductions in space. At the same time, tunnels can also amplify certain features of sound, particularly reverb, one of the most important tools in any dub technician’s tool kit, and one which is used amply on this record.