I was wondering, when you compose something that includes magnetic tape, how does it work when somebody else wants to perform that work? Do you send out a copy of that tape? I am thinking of some Nono works that use tape and live instruments. Can you get those tapes somewhere along with a score? I guess it would be digitalized by now. How does it work? In a piece like Electric Countetpoint by Reich, though, I would guess that you create the tape/file yourself, right?