I love it when a composer takes the flute in hand and explores its sounds while writing for flute. It shows more dedication and curiosity than just looking up techniques in a book (not to disparage the good books about writing for flute). Sometimes, it can produce an original sound, but sometimes it re-invents the wheel. Which is fine, but the wheel may come with a new symbol and complicated instructions. I have seen this cause frustration, esp. when the instructions are lengthy and not in your language. Once you reach understanding: “ah ha, so it is ____(fill in known technique)” it may be easy to adjust to a new notation. If not, then I am faced with the question, do I spend time re-notating, or visually re-adjusting to the score? This is something I will come back to.
In no way do I wish to discourage composers from exploring flute sounds themselves. However, be aware that today there are not only books, but a rash of flutist composers out there who have spent decades thinking about how to write new sounds in ways that flutists can easily understand. So if you really want to delve into the world of new sounds, check out these composers and their written scores: (Feel free to add to this list in the comments, but please keep it to composers who use extended sounds.)
It might interest you to look at the late flute works of Karlheinz Stockhausen. Thanks to his collaborator, Kathinka Pasveer, everything is 100 % playable and extremely well notated. Xi, Flautina and Kathinka’s Gesang are several examples of well-notated techniques.
You will see that even among flutist composers there is no standardization of extended techniques. However if you study them, you get a feel for what is accepted and what the players are used to reading. So take your pick; if the player has questions, you can always refer back to the piece or composer from which you took the notation.
Now, about re-writing, or rather, re-notating. When the question comes whether to spend my time re-notating or to spend time learning a tricky or non-intuitive (for me) notation, I almost always choose to re-notate. This might be to more easily read the notation of an extended technique, microtones, or rhythm, etc. Please note this is a last-resort solution. I am already comfortable with many variations of key-click, tongue pizz, air sound, and multiphonic notations. However, when the score presents a real visual problem for me, I decide to re-notate. This has the following advantages:
- I get to know the music really well away from the instrument
- While practicing, I can easily and more directly process the composer’s intent (i.e. the music)
- In concert, I feel more secure. When under pressure, there is enough extraneous sensory information and certainly there are enough extraneous emotions to deal with. If you are not playing from memory, the score is your anchor. It has to be solid.
In the olden days, copying scores was one way students learned music. There is a lot to be said for this method, but I don’t recommend subjecting 21st century ensemble players to it. Solo pieces are different matter. However, if your piece is being work-shopped along with six other pieces in the course of one day, your piece will stand out, but not in the way you hoped