+This is mainly useful for writing music functions that need to
+have some property changed just for the duration of the function.
+
+@item
+@code{\tag}, @code{\removeWithTag}, and @code{\keepWithTag} can
+now accept a list of symbols rather than just a single symbol for
+marking, removing, and keeping music with any of multiple tags.
+This is particularly important for @code{\keepWithTag} since one
+cannot achieve the same effect by using multiple consecutive
+@code{\keepWithTag} commands.
+
+@item
+The @samp{-d old-relative} option has been removed. Not actually
+accessible from the command line any more, its remaining use was
+for interpretating @code{\relative} in LilyPond files converted
+automatically from version@tie{}1.8 or older. It is unclear how
+much of this was actually still operative.
+
+@item
+The meaning of @code{instrumentTransposition} has been reversed.
+After
+@example
+\set instrumentTransposition = #@{ b #@}
+@end example
+a written @code{c'} now sounds like @code{b}. Previously, this
+would have been the other way round. This and the following change
+should make dealing with transposing instruments more
+straightforward.
+
+@item
+The music generated by @code{\set} and @code{\override} commands
+is no longer affected by @code{\transpose}. The main consequence
+is that @code{\transpose} will transpose audible/@/concert pitch and
+printed pitch by the same amount even when the transposed music
+contains @code{\transposition}. Previously,
+@example
+\transpose c' f' \transposition bes'
+@end example
+was equivalent to @code{\transposition f'}. Now it stays
+equivalent to @code{\transposition bes'}.
+
+@item
+Tuplets are now created with the @code{\tuplet} command, which
+takes a fraction @code{@var{t}/@var{n}} to specify that @var{t}
+notes are played in the time usually allowed for @var{n}. One
+@code{\tuplet} command can create several tuplet groups if their
+duration is typed after the fraction.
+@lilypond[quote,verbatim,relative=2]
+\tuplet 3/2 { c8 d e } \tuplet 3/2 { f e d } c2
+\tuplet 3/2 4 { c8 d e f e d } c2
+@end lilypond
+The @code{\times} command with its inverted fraction order
+@code{@var{n}/@var{t}} is still available.