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When a music expression is parsed, it is converted into a set of Scheme music objects. The defining property of a music object is that it takes up time. Time is a rational number that measures the length of a piece of music, in whole notes.
A music object has three kinds of types:
\simultaneous leads to
a SimultaneousMusic. A list of all expressions
available is in the internals manual, under Music expressionsexpressions.
event, but it is also a note-event,
a rhythmic-event and a melodic-event.
All classes of music are listed in the internals manual, under Music classes.
Event object, while
\grace creates a Grace_music object.
We expect that distinctions between different C++ types will disappear in the future.
The actual information of a music expression is stored in properties.
For example, a NoteEvent has pitch and
duration properties that store the pitch and duration of that
note. A list of all properties available is in the internals manual,
under Music properties.
A compound music expression is a music object that contains other
music objects in its properties. A list of objects can be stored in
the elements property of a music object, or a single `child'
music object in the element object. For example,
SequentialMusic has its children in elements,
and GraceMusic has its single argument in
element. The body of a repeat is in element property of
RepeatedMusic, and the alternatives in elements.
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