5.1.5 Changing context default settings
Context and grob properties can be changed with \set
and \override commands, as described in
Modifying properties. These commands create music events,
making the changes take effect at the point in time the music
is being processed.
In contrast, this section explains how to change the default
values of context and grob properties at the time the context is
created. There are two ways of doing this. One modifies the default
values in all contexts of a particular type, the other modifies the
default values in just one particular instance of a context.