PreviousMusic

[Fairchild]

Further experimentation finds
a b                       not acceptable
{ a b }                  acceptable
\score { a b }        not acceptable
\score { { a b } }  acceptable

This code
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\version "2.4.3"
A = { a }
B = { b }
\score{ \A \B }
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
scores only the "b", and produces this in the Cygwin window
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% $ lilypond -f ps PreviousMusic GNU LilyPond
2.4.3 Processing `PreviousMusic.ly' Parsing...

PreviousMusic.ly:4:10: error: Already have music in score: \score{ \A
           \B }

PreviousMusic.ly:4:7: error: This is the previous music: \score{
        \A \B }
Interpreting music... [1]
Preprocessing graphical objects...
Calculating line breaks... [2]
Layout output to `PreviousMusic.ps'...
Converting to `PreviousMusic.pdf'... %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

A workaround is to change the fourth line to
\score{ \transpose a a { \A \B } }

                                          - Bruce