Sure! The rhyme scheme for the provided excerpt is AABB. The last two lines are:
"Wherever they are sung." (B)
This suggests that the following line needs to rhyme with "sung".
Here, you would complete the rhyme by providing another line that rhymes with "sung", let's say:
"For the hearts that love the tongue." (B)
So the complete rhyme scheme in this case would be AABB, and you would place your selections accordingly.