They're Here
Reimagined by Stanislav Nikolov.
"In this piece, I wanted to play with time and frequency to explore the richness of the organic and synthetic in bird calls and helicopter drones. I pitched the bird calls down in frequency to create lower and more extended tones. I also pitched the recording up and used very short loops to create synthetic-sounding noises from the organic sounds. To reference another source of organic tones, I closed the piece with a chorus of very pitched down crickets recorded on my terrace in Bulgaria."
Part of the Sounding Nature project - for more information, see http://www.citiesandmemory.com/sounding-nature