One more thing about "Turning" (LES MIZ), the story is about "revolution," which, if you noticed, is symbolized by the "revolving" stage. The song talks about "the turning of the years," a phrase which is also used by Valjean earlier in ACT I, and thus the story comes "full circle" with its inclusion. Taking out won't make any sense, at least to people like me who have analyzed the show repeatedly.
Salve, Regina, Mater misericordiae
Vita, dulcedo, et spes nostra
Salve, Salve Regina
Ad te clamamus exsules filii Eva
Ad te suspiramus, gementes et flentes
O clemens O pia