Begin lyrics only with new section

[address@hidden]

Hey all,

Say, for example, I have:

mA = { some music }
lA = { lyrics to some music }
mB = { some more music }
lB = { lyrics to some more music }
mC = { even more music }
lC = { lyrics ot even more music }

and all of these are strung in a row :

{ \mA \mB \mC }
\addlyrics { \lA \lB \lC }

Let's say that on the interior of B I add a lot of new music but I don't have 
lyrics yet.  It is fastidious to count how many notes I added and put skips, so 
as a result, all the lyrics from C shift under B.  Is there a way to avoid this 
by indicating somehow that lC is not supposed to begin until mC begins?

Cheers,
MS