Internal context properties
     
associatedVoiceContext (context)- The context object of the Voice that has the melody for this Lyrics. 
 barCheckLastFail (moment)- Where in the measure did the last barcheck fail? 
 beamMelismaBusy (boolean)- Signal if a beam is present. 
 breakableSeparationItem (layout object)- The breakable items in this time step,
for this staff. 
 busyGrobs (list)- a queue of (end-moment . GROB)
conses. This is for internal (C++) use only.  This property contains
the grobs which are still busy (e.g. note heads, spanners, etc.)
     
 currentCommandColumn (layout object)- Grob that is X-parent to all
current breakable (clef, key signature, etc.) items. 
 currentMusicalColumn (layout object)- Grob that is X-parent to all
non-breakable items (note heads, lyrics, etc.). 
 dynamicAbsoluteVolumeFunction (procedure)- [DOCUMENT-ME]
 finalizations (list)- List of expressions to evaluate before proceeding to next time step. Internal variable. 
 graceSettings (list)- Overrides for grace notes. This property should
be manipulated through the 
add-grace-property function. 
 instrumentSupport (list of grobs)- list of grobs to attach instrument name
to. 
 lastKeySignature (list)- Last key signature before a key
signature change. 
 localKeySignature (list)- the key signature at this point in the
measure.  The format is the same as for keySignature, but can also
contain ((octave . name) . (alter . barnumber))
pairs. It is reset at every bar line. 
 localKeySignatureChanges (list)- Experimental. [DOCME]
 melismaBusy (boolean)- Signifies
whether a melisma is active. This can be used to signal melismas on
top of those automatically detected. 
 originalMiddleCPosition (integer)- Used for temporary overriding middle C in octavation brackets. 
 quotedEventTypes (list)- List of symbols, representing the
event types that should be duplicated for 
\quote commands. 
 rootSystem (layout object)- The System object
 scriptDefinitions (list)- Description of scripts. This is used by
Script_engraver for typesetting note-super/subscripts. See
scm/script.scm for more information
     
 slurMelismaBusy (boolean)- Signal if a slur is present. 
 stavesFound (list of grobs)- list of all staff-symbols found. 
 tieMelismaBusy (boolean)- Signal whether a tie is present.