Contexts are usually terminated at the first musical moment in
which they have nothing to do. So @code{Voice} contexts die as
-soon as they contain no events; @code{Staff} contexts die as soon
-as all the @code{Voice} contexts within them contain no events; etc.
+soon as they contain no events, @code{Staff} contexts die as soon
+as all the @code{Voice} contexts within them contain no events, etc.
This can cause difficulties if earlier contexts which have died
have to be referenced, for example, when changing staves with
@code{\change} commands, associating lyrics with a voice with
VerticalAxisGroup groups together different grobs like Staff, Lyrics,
etc. VerticalAlignment then vertically aligns the different grobs
grouped together by VerticalAxisGroup. There is usually only one
-VerticalAlignment per score but every Staff, Lyrics, etc. has its own
+VerticalAlignment per score but every Staff, Lyrics, etc., has its own
VerticalAxisGroup.