Write down the theme of the following poem. (Not more than 50 words):

Under the greenwood tree

Who loves to lie with me,

And turn his merry note

Unto the sweet bird's throat―

Come hither, come hither, come hither!

Here shall he see

No enemy

But winter and rough weather.

Who doth ambition shun

And loves to live i' the sun

Seeking the food he eats

And pleased with what he gets -

Come hither, come hither, come hither!

Here shall he see

No enemy

But winter and rough weather.

Blow, blow, thou winter wind,

Thou art not so unkind

As man's ingratitude;

Thy tooth is not so keen,

Because thou art not seen,

Although thy breath be rude.

Heigh-ho! sing heigh-ho! unto the green holly, Most friendship is feigning, most loving mere folly: Then heigh-ho, the holly!

This life is most jolly.

Freeze, freeze, thou bitter sky,

That dost bite so nigh

As benefits forgot:

Though thou the waters warp,

Thy sting is not so sharp

As friend remembered not.

Heigh-ho! sing heigh-ho! unto the green holly...