[link to original on tumblr]
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Also, I got to thinking about the story that Argent's frequently told about how the line "Your daddy's rich, and your mama's good-lookin'" inspired the "Who's your daddy / Is he rich?" in "Time of the Season." I think I found a few other lyrical nods to "Summertime" in "Time of the Season." Both have a temporal element in their title and lyrics ("Summertime" and "Time of the Season," although Argent's also told the story about how he got the phrase "Time of the Season" from mishearing the lyrics in a Miracles' song), and both describe something as "high." "Summertime" has "the cotton is high," and the "time of the season" in "Time of the Season" is "When love runs high." There's a slightly different meaning there, but it's the same word in a similar description.
I would have thought those merely coincidental similarities were it not for Argent's admission of that "Your daddy's rich"/"Who's your daddy / Is he rich?" reference.