Noteheadtype from scheme

[Rune Zedeler]

The command "\property Voice.NoteHead \override #'style = #'cross" is
displayed as

#<Music Context_specced_music
    context-type = "Voice"
    origin = #<location apply.ly:9:74>
    element = #<Music Music
                  origin = #<location  (position unknown)>
                  grob-value = cross
                  grob-property = style
                  symbols = NoteHead
                  iterator-ctor = #<encapsulated C++ function>
               >
    type = context-specced-music
>

Which chould mean that the element is created with (ly-make-music
"Music").
But if you set (let* ( (m (ly-make-music "Music") ) ), lily Core Dumps.
How am I supposed to do?

-Rune