Transposing instrument best practice

[Simon Albrecht]

Hello everybody,

I have practically never had to typeset music for transposing 
instruments before, so I have barely any experience with this topic. The 
documentation confuses me, since the NR has two sections talking about 
transposing instruments, each giving different advice:

1.1.3.d recommends entering the notes in ‘written’ pitch and using 
\transposition to get correct MIDI, cues and quotes. In ‘See also’, it 
links to

1.1.2.b, where the recommendation is to enter the notes in concert pitch 
and use \transpose to display them in transposed, written pitch.

Keith O’Hara, in 
<https://sourceforge.net/p/testlilyissues/issues/4264/>, writes that ‘we 
usually suggest that the variables holding music for transposing 
instruments store the music in concert pitch.’

Given the highly confusing nature of the subject, wouldn’t it be better 
if the NR took a clear stance toward one of the ways as ‘best practice’?

Which way would that be? What experiences did you make?

Best, Simon