Recently, I was thinking about "What a Friend We Have in Jesus" and discovered a musical feature in one of the lines, but then I found that I'd already noticed this and added it to my list of things to write about. Lest I rediscover this a third time, I'm writing about it now.
In the first verse, there are the lines "What a privilege to carry / Ev'rything to God in prayer!" At the end of the verse there are similar lines (sung to the same musical phrase) reflecting on the "needless pain we bear - / All because we do not carry / Ev'rything to God in prayer!" Here's the notation for those two lines, from the tune "Converse":
The syllables of those two "ev'rything"s are all sung to different pitches (C F A) and - altogether - span a sixth, and these two musical features highlight the variety and breadth of "ev'rything."
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For what it's worth, here's a post from last June about some more musical features in "What a Friend We Have in Jesus."