"Slow, Slow, Fresh Fount" is a song from a play, a song that reflects on the act of singing as a way to channel grief. At times the poem even implies that art or singing can actually help somebody who is grieving. But at other moments the poem makes us think that singing about our sadness only serves to prolong it and keep us miserable. But hey, who doesn't love a good wallow every now and then?
The rhyme between "sings" and "springs" tells us that art has the power to help us cope with grief and see new life after death.
The poem's repeated references to grief suggest that, sometimes, art (like a song) only reinforces or prolongs our grief.