"5D (Fifth Dimension)"

I listened to The Byrds' Greatest Hits yester-day and noticed some significance in the melody of "5D (Fifth Dimension)."  In the line "And be still floatin'," "still" has a longer value than the surrounding notes (roughly two full measures), and this duration gives some sense of continuation, illustrating the word's meaning.  Similarly, "all" in the line "I found all surroundin'" is held longer than its surrounding notes, here giving a sense of extent.