Nesting ly:music-property error

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Evening all.

I've been working on some scheme functions currently working on displaying the actual scheme coding while referring primarily to 6.3.2 Music Properties

The following is working

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myN = #(define-music-function (parser location myx ) (ly:music?)
#{
#(display-scheme-music (ly:music-property $myx 'elements))
#})

    \myN c

Which Returned ==>

(list (make-music
        'NoteEvent
        'duration
        (ly:make-duration 2 0 1 1)
        'pitch
        (ly:make-pitch -1 0 0)))
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However when I try and display the pitch only with
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myN = #(define-music-function (parser location myx ) (ly:music?)
#{
#(display-scheme-music (ly:music-property (ly:music-property $myx 'elements) 'pitch))
#})

    \myN c

I get an error

GNU lilypond 2.12.3
Processing "displaymusic.ly"
Parsing...
<string>:2:1: error: GUILE signaled an error for the _expression_ beginning here
#<display-scheme-music (ly:music-property (ly:music-property lilyvartmpb (quote elements)) (quote pitch)))
Wrong type argument in position 1 (expecting Music): (#(Prob: Music C++: Music((duration . #(Duration 4 )) (pitch . #(Pitch c )) (origin . #(location displaymusic.ly:8:13))((display-methods #(procedure #f (note parser))) (name . NoteEvent) (types general-music event note-event rythmis-event melodic-event)) >
)
displaymusic/ly:0: warning: no \version statement found, please add

\version "2.12.3"
for future compatibility
warning: no music found in score

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I've looked at the manual several times and haven't recognized a solution.

So what am I missing?

Thanks Scott