"Strawberry Fields Forever"

The last thing I noticed while listening to the 2 CD Anniversary Edition of Sgt. Pepper a few days ago is in "Strawberry Fields Forever" (apparently included - along with "Penny Lane" - because it was recorded during the Sgt. Pepper sessions).  The "low" in the line "I mean it must high or low" is sung with a descending melisma.  Because the final version of "Strawberry Fields Forever" was creating by combining two performances in different keys (speeding up one and slowing down the other), there's always a question of tonality, but I think the notes to which "low" is sung end up as something like C Bb G.  As it's sung, the word itself descends, giving a musical impression of "low."