"My Back Pages"

I listened to The Byrds' Greatest Hits yester-day and noticed a small feature in "My Back Pages."  Most of each verse is sung by Roger McGuinn alone, but more voices join in for the final line "Ah, but I was so much older then; I'm younger than that now."  In a way, these extra voices match the greater degree of the adverbial phrase "so much" and the comparative adjectives "older" and "younger."

I was thinking about the song again this morning and realized that the alliteration in the phrase "quite clear" in the fourth verse also provides a degree of emphasis.