Last chance for a while ....

[Dave2002]

I seem to recall, however, that the instructions quoted postdate the score by some years.

This set of instructions is closer to those I was introduced to back in 1969.

Those instructions are labelled "for Beginners" - so maybe the other instructions are for more advanced players! Or maybe simply a different (newer?) version.

[Dave2002]

There are, of course, other similar pieces... Dorian Mix, for example

Can't find Dorian Mix, but I found Dorian Reeds - https://www.youtube.com/watch?v=29U9SkOg9is

There are several YouTube versions I think.

This is mentioned in this book - https://books.google.co.uk/books?id=...0Reich&f=false

[ferneyhoughgeliebte]

Those instructions are labelled "for Beginners" - so maybe the other instructions are for more advanced players! Or maybe simply a different (newer?) version.

Very possibly. I think that the earliest performances didn't need the instructions, as the composer - or others who had performed in the work with him - was involved in those performances. Word of mouth - together with the recording of the work from 1968 - was enough to give performers an idea of how the work should be done. The variations in the different published "Instructions" look like the result of the intervening years of different experiences. (It seems as if there are three different ways of ending a performance, for example: a sustained note/a gradual fading out/a particular number of repetitions of the last phrase and then stop - with or without cresc/dims.)

[Dave2002]

More scores from Terry Riley here - http://terryriley.net/sheetmusic.htm

[MrGongGong]

Can't find Dorian Mix, but I found Dorian Reeds - https://www.youtube.com/watch?v=29U9SkOg9is

There are several YouTube versions I think.

It's the same piece
It exists in several versions depending on the instrumentation

The Bassoon version is good IMV