@cindex override syntax
@funindex \override
-@funindex override
We have already met the commands @code{\set} and @code{\with}, used to
change the properties of @strong{contexts} and to remove and add
@cindex revert command
@funindex \revert
-@funindex revert
Once overridden, the property retains its new value until it is
overridden again or a @code{\revert} command is encountered.
@unnumberedsubsubsec The @code{\once} prefix
@funindex \once
-@funindex once
Both the @code{\override} and the @code{\set} commands may be prefixed
by @code{\once}. This causes the following @code{\override} or
@cindex overrideProperty command
@funindex \overrideProperty
-@funindex overrideProperty
There is another form of the override command,
@code{\overrideProperty}, which is occasionally required.
@cindex tweak command
@funindex \tweak
-@funindex tweak
The final tweaking command which is available is @code{\tweak}. This
should be used when several objects occur at the same musical moment,
@cindex once override
@funindex \once
-@funindex once
As you can see, @emph{all} the slurs are thicker in the final example
above. But what if we wanted just the first slur to be thicker? This
@cindex default properties, reverting to
@funindex \revert
-@funindex revert
Finally, what if we wanted just the first two slurs to be
heavier? Well, we could use two commands, each preceded by
@cindex ottava bracket
@funindex \startTextSpan
-@funindex startTextSpan
@funindex \stopTextSpan
-@funindex stopTextSpan
@cindex TextSpanner, example of overriding
@cindex bound-details property, example
@cindex notes, spreading out with text
@funindex \textLengthOn
-@funindex textLengthOn
@funindex \textLengthOff
-@funindex textLengthOff
By default, text produced by markup takes up no horizontal space
as far as laying out the music is concerned. The @code{\textLengthOn}