[link to original on tumblr]
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This reminded me that there are references to that same line in "A Moment in Time" from the Zombies' Breathe Out, Breathe In and "Circus" from Argent's Circus.
"Are You Lonesome Tonight?" is from 1960, so it's after the Elvis period that Rod Argent really likes (he said that in the first three years, Elvis' voice was "transcendent"). (I think one of the Beatles said that after Elvis was in the army, his music wasn't as good, which seems to be the same position that Argent takes.) It's unlikely then that this Shakespeare reference inspired the same Shakespeare reference in these Argent-related songs, but I still think it's interesting that - despite how "Are You Lonesome Tonight?" is after that revered Elvis period - it has that same reference in common.