From Cooper's Hill in Egham I recorded the mixture of birds and planes. I didn't edit too much, as I wanted the 'natural' rhythm of the planes to be close to what it was on the day. The loudest planes are those that head east after takeoff due to them turning and heading pretty much overhead. 

Used 2xClippys and an Audio Technica BP4025 as I find the Audio Technica gives the tones I want for recording machines. 

Recorded on the 28th March from midday.

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