I wanted to thank everybody for the help. I had it all mixed up.
The shortInstrumentName must come before the \trumpet part, etc. otherwise it
won't work.
I forgot to group with curly braces as well. This worked like a charm though:
\book {
\score {
<<
\new StaffGroup = "horns"
<<
\new Staff = "trumpet" \transpose c c {
\set Staff.shortInstrumentName = "Tpt "
\trumpet
}
\new Staff = "clarinet" \transpose c c {
\set Staff.shortInstrumentName = "Clr "
\clarinet
}
...
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