Re: [Best Practices] instrument changes

[Janek Warchoł]

2011/6/28 Kieren MacMillan <address@hidden>:
> Hello all,
>
> I would love to put together a "Best Practices" example/snippet/document

Good idea!
I don't write much music for transposing instruments, so i cannot give
any advice, but i have a question that may trigger a discussion: how
to prepare scores with transposing instruments so that they are
structurally correct? Consider this canon:

common = {
  \key e \minor
  \time 4/4
}
melody = \relative c' {
  e4 d8 fis e4 b |
  e8 e fis fis g a16[ g] fis4 |
  b8 b a a g a16 g fis8 b, |
  e4 d8 fis e2
}
<<
  \new Staff = violin { \common \melody R1 }
  \new Staff = "clarinet in A" \transpose a c' { \common R1 \melody }
>>

If i understand how transposing instruments should be notated, the
output is how it should look like from a performer's point of view.
However, it is structurally wrong: for example MIDI output will be
bad, because internally the two parts have differently pitched
melodies (while they should be pitched the same and only displayed
differently).
What is the correct way of doing this?

thanks,
Janek