shortInstrumentName help

[Stan Mulder]

I'm want my score to have short instrument names. What I've got is not working.
Apparently I need to separate the trumpet and clarinet contexts but I'm not sure
how to do that.


\book {
        \score {
        <<
                \new StaffGroup = "horns" 
                <<
                                \new Staff = "trumpet" \transpose c c \trumpet
                                \set Staff.shortInstrumentName = "Tpt "
                                \new Staff = "clarinet" \transpose c c \clarinet
                                \set Staff.shortInstrumentName = "Clr "
                >>
        >>
        \midi { }
        }
}