My first define-music-function, I'm trying, need help

[Rick Hansen (aka RickH)]

The simple substitution example below should be pretty easy, but I'm "in a
pickle", can someone show me how to replace the note name in the transpose
statement with the note specified on the function call (parameter called
"root")?

But it gets the following error:

<string>:2:13: error: syntax error, unexpected MUSIC_IDENTIFIER, expecting
NOTENAME_PITCH or TONICNAME_PITCH
\transpose c 
             \lilyvartmpb { \relative { <c e g> } }


<<<<<<<< EXAMPLE BEGIN

\version "2.11.4"
\include "english.ly"

myChord = #(define-music-function (parser location root) (ly:music?)
#{
\transpose c $root { \relative { <c e g> } }
#})

   \new Staff {

        % An A chord
        %\transpose c a { \relative { <c e g> } }

        % Theoretically, this should also generate "an A chord" just like
above
        \myChord a

   }



<<<<<<<< EXAMPLE END


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