In "Come, Thou Long-Expected Jesus," sung to the tune "Jefferson," there are a handful of melismas that provide a sense of duration: "long-expected" (D F G Bb A G) in the title line, sung to this phrase:
"forever" (A G A G) in the line "Born to reign is us forever" in the second verse, sung to the same phrase (repeated as the third musical phrase), and "eternal" (D Bb A G) in the line "By Thine own eternal Spirit" in the second verse, sung to this phrase:
In the lines "Dear desire of ev'ry nation, / Joy of ev'ry longing heart" at the end of the first verse, both "ev'ry"s are sung with melismas (Bb A G and D F G, respectively), giving a sense of number or amount. Here are the corresponding musical phrases: