"Joys" is sung with a melisma (C Bb), giving something of a sense of ebullience. The text here in the fourth verse is "Then let our songs abound, / And ev'ry tear be dry." "Songs" is sung with a melisma (C D) for a sense of "abound[ing]," and "tear" is sung with a melisma (C Bb) for a sense of "ev'ry."
The second half of the refrain is "We're marching upward to Zion, / The beautiful city of God," sung to these phrases:
"We're marching upward to Zion" is sung to a generally ascending melody, illustrating that "upward."
