i would add to that advice...this site has an extensive lyric database.
If you type "tree" into the search box you will get dozens of songs.

Joyce Kilmer..a poem called Tree, which may have been made into a song

    I think that I shall never see
    A poem lovely as a tree.

    A tree whose hungry mouth is prest
    Against the earth's sweet flowing breast;

    A tree that looks at God all day,
    And lifts her leafy arms to pray;

    A tree that may in summer wear
    A nest of robins in her hair;

    Upon whose bosom snow has lain;
    Who intimately lives with rain.

    Poems are made by fools like me,
    But only God can make a tree.