Yes, I mentioned the Lambeth Children, O by Malvina Reynolds..

here are the lyrics...
http://www.lovelylambeth.com/history-03.html

and here:
http://www.wku.edu/~smithch/MALVINA/mr087.htm

also there is a line in the song "the Water is Wide"

midi here:
http://www.ireland-information.com/irishmusic/thewateriswide.shtml

"i leaned my back against an oak....
thinking it was a trusty tree
but first he bent and then he broke..
so did my love prove false to me"

there is also another song about how it is good
to be flexible like the willow (or grass?)
and bend instead of breaking like an oak...

not sure if it is walk the way the wind blows??? or not...