I was going to write an article about the science and personnel issues behind this but The Guardian have beaten me to it and done a much better job. In particular, the story of Korosov, the lead engineer, is impressive and needs to be acknowledged.
This song was an experimental song than usual for me, trying out synth MIDI bass lines and dance rhythms. I’m particularly chuffed at the end of the song having recordings of Gagarins real radio broadcasts from that flight. When I get to that point in the song I like to close my eyes and really try to imagine what that was like to be sitting in the cockpit. I have a feeling of serenity wash over me that is probably completely different from what it was actually like to be in that situation!