Steve Knightley of Show of Hands wrote 'The Oak', and it's on their Beat About the Bush Album. It also crops up in version of Ashley Hutchings and Judy Dunlop's Sway With Me: an album of songs and writing in praise of trees! A little sappy at times (sorry) but could give you some ideas.

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More poor jokes and British folk music on Cool as Folk radio. www.coolasfolk.co.uk