This is segment II from a 6-hour sound capture we took earlier this year at Kielder Forest in Northumberland. Recorded in spring, the environment is rich with birdsong, mainly willow warblers whose song is a short and very cheerful descending scale. We'd been walking along one of the rough paths that thread through the forest below the Kielder Observatory and had found exactly what we'd travelled up to this specific area to record. The hushing sound of wind in tall fir trees.

Of course these are no ordinary trees. They are Grandis Firs. Vertically vast. Each the size of a 15 storey tower block, with huge drooping boughs draped in billions of tiny pine needles. Every needle catches in the wind and converts the energy into audible sound. Individually it's hard to imagine one could hear anything produced from one needle at all, but heard altogether, the sound is powerful. Deeply moving. Akin even to a spiritual experience. After finding a suitable tree to rest the Lento box against, we left it behind in the forest to record the scene alone, hoping the wind would not die down.

The wind continued to blow in slow undulating waves. And the willow warblers continued to sing their lovely droopy songs, no doubt perched on the droopy boughs of the giant firs. But the trees and the birds were not the only aural presences in this part of the forest. There's a rushing stream, flowing from left to right of scene. It issues its own fresh bright sound to the interior space of the forest, as it rushes down into the valley to join the city-sized reservoir below.

* At 18 minutes into this segment a plane flies over, but don't worry, it's relatively soft and gentle, flying high up above the clouds. It may initially be hard to tell whether the white noise is from the stream or wind in the firs in this recording. Over time, and as your ears adjust to the aural environment, the distinct qualities of the stream and the wind in the firs may resolve out. Both are highly spatial and texturally different. They often blend into one another, then part, like vails woven from different fabrics, billowing together in currents of air.

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