Music Typesetting. I've published a book and have been involved with a few related projects. I do pretty good work here. It pains me showing up to rehearsal and seeing poor quality sheet music on my stand. It's worse when these mistakes cause stoppage during rehearsals--usually easy mistakes that the person creating the end product could have fixed saving rehearsal time.
I believe Henle was one of the last hold-outs doing hand engraving of their scores (there are some good videos on youtube showing the process). Today I'm not sure what they use (I've seen one reference say they use finale). Here's some work to recreate that style in finale: http://notat.io/viewtopic.php?t=46
I use lilypond. It tends to get scores mostly right saving time in proof reading and tweaking. With each new version of lilypond it feels like less needs to be tweaked to make it correct.
