To tell you the truth I had no idea what those voices would be." Speaking on the phone to him I can hear the pace of his ideas rushing out. He speaks directly albeit in a broken style with sentences trailing off, constantly revising himself, his method and his execution - a style which mirrors the way he approaches his work. Often sticking to formats, Reich's career is a series of revisions, reimaginations and extentions. In this instance Reich is stuck, trying to deal with voice recordings and harmonisation. Then, David Harrington, of minimalist ensemble and long-term Reich collaborators The Kronos Quartet, called Steve, inviting him to return to pre-recorded sound. "When David's phone call came in it was an invitation to sort of go back to that way of working and I had had a long time out and I was like, 'This might be interesting'. So months later as I say, when the lightbulb went on I thought, 'My gosh, how can I be so stupid? I've got unfinished business. We've lived for twenty-five years four blocks from Ground Zero. Gee, you know, I never dealt with 9/11. It was a big event in my life and it's definitely not over. This is obviously what I should be doing.' And then I knew that I had to get the documentary sources from the people who were there, who were involved. Like first of all, the traffic controllers who saw the plane going off course, second of all the