I have updated this one. Easy to figure out what key arises if I use an F whistle instead of a D but what if the music is written in Ab ? How to rewrite the score in a more friendly key and choose a whistle so the result comes out in the key of Ab?
Hi Brian! That’s a nice chart, and interesting. But a bit boggling, too. Isn’t it easier (and more portable) just to refer to the basic circle of fifths?
All questions regarding keys and transposition can be answered using a linearized chart of fifths and a few simple rules:
Db Ab Eb Bb F C G D A E B F#
Any whistle can easily play the 3 major keys centered around its own key in the list.
Any major key can be played by the 3 whistles centered around that key in the list.
The key to the LEFT of a whistle key is always the G-fingering. The key to the RIGHT is always the A-fingering. And the whistle key itself is always the D-fingering.
Some examples:
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On the chart you see G D A. So a D whistle (in the middle) can play in D, G and A. On the chart you see Bb F C. So an F whistle can play in F, Bb and C.
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On the chart you see F C G. So to play in the key of C (in the middle), you can use an C, F or G whistle. On the chart you see Db Eb Ab. So to play in Eb, you can use an Eb, Db or Ab whistle.
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On the chart you see D A E. So on an A whistle, the A-fingering (to the RIGHT) gives concert E. On the chart you see Ab Eb Bb. So on an Eb whistle, the G-fingering (to the LEFT) gives concert Ab. On the chart you see G D A. So on a D whistle, the D-fingering (in the middle) gives concert D.
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You pick up an F whistle and read a sheet of music in the key of A as-is, using A-fingering. On the chart you see Bb F C. A-fingering is to the RIGHT of F. So you’re actually playing in concert C.
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Now you need to play that same sheet music in concert A with a piano. But you don’t have a D or A whistle. On the chart you see D A E. So you pick up your E whistle, play with G-fingering (to the LEFT), and transpose the written music to G. The music sounds in concert A.
Of course, the algorithm can be generalized to all keys, modes and fingerings. For example, E fingering (D+2) on a Bb whistle gives concert C (Bb+2). But the clusters of 3 keys cover the practical basics.
Geez MTGuru…how can you be so technical so early in the morning?! It’s 6:45am here and I’m barely awake! I won’t be able to process your reply untill I’ve consumed enough caffeine to give a horse the jitters. 
Sleepless in San Diego, Jason. 
Thanks MTguru. I have attached the circle of 5ths list to my crib sheet:
tunes I know with first few notes.
I think my matrix wins on ease of use but yours wins hands down on compactness.
I would probably play it on an Eb whistle, Ab being the fourth on an Eb whistle. I also have an Ab whistle but don’t use it much (wonder why…)
I came up with a Whistle Transposing Chart where I approach the issue in a very pragmatic way- I list the two major keys each whistle produces (from the fundamental and the fourth, because which you use depends on the range of the tune), and the two true minor keys each whistle produces (from the second and the sixth). This chart has helped me quickly find the right whistle at gigs.
Great! Now I have to re-do my chart! 
This is excellent info, MT, as usual. Thanks greatly! 
Great diagram!!!
Have you tried translating this into a circular diagram? You know - like a clock?! I always think of the circle of fifth as as the face of a clock - 12 o´clock is C Major and 6 o´clock is G flat Major (makes it easier to visualize). If you made a turnable upper disc with the whistle keyes and the lower (slightly larger) with the actual key this could be an interesting and useful tool! I made a educational tool for navigation with three layers, a couple of years ago (the the earth/horizon, the sun and the equator) and it worked beautifully.
Yeah, I thought of that, too.
Nah, your chart is safe, and bjs’s chart, too. I think charts are really useful. I just prefer a “calculated” approach, if possible, that I can keep in my head or jot down on a napkin.
Panceltic … In my scheme, the 3 minor key fingerings are the 3 to the right of the whistle key, in the order A Dorian, E Dorian/Minor, and B Dorian/Minor (with respect to D). So to pick the correct whistle, you find the tune key and use one of the 3 whistles keys/fingerings to the left, depending on the mode:
[BDor/Min fingering] [EDor/Min fingering] [ADor fingering] [Tune Key]
For example, for a tune in E Dorian, the circle says: G D A E
That gives ADor fingering on an A whistle, or EDor fingering on a D whistle, or BDor fingering on a G whistle.
Yes, a circular “whistle wheel” based on the circle of fifths would probably work pretty well. Hmmm …
Quick, patent it and get into production! I’m sure Annie could incorporate them into one of the surfaces of her fantastic new bag! Luminous ones would be good for those dingy sessions and ill-lit gigs! I’m sure, done on two discs of stiff-but-flexible plastic pinned together, they’d be the kind of thing that could be mass produced very cheaply and printed with advertising, say for an outlet or venue - like key-fobs etc… Get your local whistle specialist shop/maker to give them away as a publicity/promo thing with every whistle sold!
Precisely what I had in mind!
LOL
Right, Jem … I plan to include it in my exclusive line of stylish MTGuru whistle accessories, including my Mute-O-Matic whistle mute (er, paper clip) and Accu-Tone fipple enhancer (er, rubber O-ring).
Actually, I have several friends who are talented graphics designers, who might be willing to tackle the Flexi-Key whistle disc …
I’ll admit I didn’t understand the chart or the critiques of it, but here’s my question. Even if you can chart out what whistle plays what key, don’t you still need all your music written in the key of D or G so you can play it? I mean, if you need the sheet music that is.
Here is another idea - if you convert your frinds design into a PDF document anyone could download it and make their own transposing wheel. Just glue the design on a piece of cardbord, cut it out and connect the discs with a clip.
http://www.maxhammondphotos.org.uk/blog/wp-content/uploads/2006/03/circle-of-fifths.gif
Using the info MTguru shared, I came up with this:
Whistler’s Little Circle of Fifths - PDF file
http://www.angelfire.com/mo/sassafrassgrove/WhistleRoll/Images/Circle_of_Fifths.PDF
EDIT: The Updated version, including instructions for use, is available in a single PDF file (2.25meg) that includes the pieces and instructions for use that fits on a single letter size piece of paper, use this link: http://www.angelfire.com/mo/sassafrassgrove/WhistleRoll/Images/Circle_of_Fifths_w_instructions.pdf
It would probably work best with a small rivet or eyelet set at the center, so that the top and bottom circles are static, while the middle one is free to turn. If I can perfect the making of it, I’ll offer them pre-made, but for now at least, they are free, to ‘make your own’.
Hope somebody finds it useful.
The PDF file will allow you to print out and put together a handy Circle of Fifths wheel that is specially designed for Whistlers. Print it onto heavy card stock, or print it on regular paper and glue it to card stock before cutting the pieces out. Instructions for assembly will print with the image. It fits within the top half of a standard letter size sheet. You can print two to a page.
Free use of this is encouraged, however it is copyright, so please do not try to sell it.
Superb, Annie!
Hey guys, this girl don’ miss a trick commercially! 'Guru, she’s jumped your gun.
Annie. are you going to buy (ha ha!) my suggestion of incorporating hard plastic versions in your gorgeous holster bags?
I’m not charging for it, jem… I didn’t do it for commercial purposes, though I may eventually produce them readymade for sale, I did it for everyone to have the benefit of the same knowledge that helped me so much…
BTW - I’d already thought of including them, and the Key-Mode chart, but since they are available free online, I probably won’t. Printing, laminating, cutting, assembling and the like is a lot of work… I’ve got enough to do already!
Annie, I know you’re not charging for the brilliant graphic you’ve posted up - thanks for doing it and so generously putting out! And I wasn’t carping, more teasing/joking. I do think there’s a small but real potential for a manufactured gadget, though. It probably wouldn’t be commercially viable just to sell, but as an overprinted thing in the key-fob type tourist/sponsorship/charity field - promotional give-away or cheap souvenir, it just might work out.
I know what you mean about the fiddle to fit extras in your bags though. I’ve done enough sewing etc. over the years to have a very good idea of how fiddly some aspects of making your wonderful looking bags must be. (I made bicycle pannier bags in stiff nylon once, for example.)
Well, your chiding got me wonder/worrying… so I wrote to MT again to make sure I hadn’t really stepped on his toes… LOL!.. I hope I didn’t! 
I make the instrument cases and a chord book, so the idea of actually selling them is not out of consideration, but they would need to be well made and durable, and I just don’t want to commit to working out all the kinks of the process while I’m still on deadline for folks’ cases and producing the next printing of the books. … maybe when there’s a lull in the activity… but I’ll probably still leave the online version free. I’m glad folks are finding it useful. Thanks for your comments, but, keep an eye out for falling objects. 
EDIT: MT and I are in communication on this … so if I suddenly disappear, ask him pointed questions.
EDIT: I’ll post the finished version in the not too distant future…