Well, it wasn't really my idea ... I didn't like the thought of doing it like everyone else–maybe a mix through the back catalog and a few exclusive new tracks by some key artists... I wanted something more special. Then a while ago I met Emika, she's making music herself on Ninja Tune. We sat together one day last summer and she told me about her last visit to Berghain. It was a regular Sunday morning and she noticed how everything in the building was resonating and vibrating and swinging and humming–she realized that there were a lot of sounds coming from the building itself. That led to the idea of doing field recordings within the building while it's not open to the public ... It took about two or three weeks ... It was a four gigabyte library.