The standard way is to use a major key signature for modes with a major third 
in them, and minor key signatures for modes with a minor third. So A lydian 
would use 3 sharps and have every D sharp manually altered with an accidental, 
as you thought.

The only exceptions I've seen are things like C fraygish (that's an F harmonic 
minor but starting on a C) that would use the F minor key signature and have 
the E altered manually.

Christopher


On 12/9/13, Robert Patterson  <[email protected]> wrote:
> So I am curious what this list thinks. You are writing a piece in A lydian
> mode. Do you use four sharps in the key sig or do you use three sharps and
> show the raised fourth as a chromatic alteration throughout the piece?
> 
> I recently encountered this situation in some contemporary church music. I
> am a horn player, so key sigs are not my strong suit, but showing 4 sharps
> for a piece in A lydian drove me crazy (and this piece was lydian
> throughout, so the problem manifested over and over in other keys as well.)
> There was one solo where I played g-natural until the after the final
> run-through before I noticed the wrong note and corrected it for the
> performance. (The conductor was gonna let it go!)
> 
> Maybe four sharps makes sense in some contexts (jazz? early music?) but it
> felt really wrong in contemporary church music, esp. consider the minimal
> rehearsal time such music gets.
> 
> Yikes I just looked at Elaine Gould, and she allows any arbitrary key
> signature. I hope I never have to face that, and in any case would end up
> penciling every one of them in.
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