Bottom line: If you are an orchestral brass player enjoying the sounds in front of you, you are already poised to enter late.
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Essay
...There are quite a few other techniques that I would broadly lump broadly into this category. Each could have their own essay, and some already do. Here are a few examples:
Knowing when to stop and fix something.
Knowing how to prioritize between competing priorities.
Knowing when to move on from a passage.
Knowing when practicing under- or at-tempo would be (in)effective....
"these differences are equally plain, yet only to those who have been initiated by practical work."
Simon Rattle rehearses the choir and orchestra of the Bavarian Radio Symphony Orchestra as they get ready for a performance of Haydn’s Creation. This brief clip demonstrates rehearsal instructions centered choral diction around a brief passage in Haydn’s Creation. The frequent stopping and starting indicates rare high-quality footage of a professional organization engaged in a true detail rehearsal, not merely a dress rehearsal run-through.
A list of some of the music sites and sources I read.