Hi Adam, the KeySig you've defined is nothing but \locrian.
If you don't want the F# to be shown (that's the tonic in F# locrian), you just need to define a ,FLAT for step 0 (the tonic), because this will lower the tonic and thus eliminate the F# from your key signature. That way, the F# will not be printed in the key signature, but it will show up each time as an accidental in the music: %%%%% \version "2.18.2" KeySig = #`((0 . ,FLAT)(1 . ,FLAT)(2 . ,FLAT)(3 . 0)(4 . ,FLAT)(5 . ,FLAT)(6 . ,FLAT)) \relative c' { \key fis \KeySig fis4 g a b c d e fis } %%%%% An alternative solution without defining a custom key signature would be abusing the \lydian mode and setting the tonic a half step lower: ;) %%%%% \relative c' { \key f \lydian fis4 g a b c d e fis } %%%%% (This works because our custom key signature now has flats everywhere except on step 3 and this is basically a shifted lydian mode which has just a sharp on step 3). Yes, that's confusing, but, after all, you can add a comment. That's the good thing about text-based formats. HTH, Torsten -- Sent from: http://lilypond.1069038.n5.nabble.com/User-f3.html _______________________________________________ lilypond-user mailing list lilypond-user@gnu.org https://lists.gnu.org/mailman/listinfo/lilypond-user