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Persian key signatures

By default, the order of accidentals in Persian key signatures is flats followed by korons, then sharps followed by soris (then double flats, then double sharps).

An alternative key order, similar to the one used in turkish-makam.ly, can be selected. Here, the order is flats or korons (or double flats), then sharps or soris (or double sharps). In other words, korons and soris are handled equal to flats and sharps, respectively.

\include "persian.ly"

{
  \key b \chahargah b'1 |
  \set Staff.keyAlterationOrder = \persianAltKeyAlterationOrder
  \key b \chahargah b'1 |
}