A song setting of the famous poem by William Blake, describing how repressed feelings of anger can lead to terrible consequences.
Some more info on the poem, particularly for GCSE students, here on the BBC Bitesize website https://www.bbc.co.uk/bitesize/guides/zgknv4j/revision/1

Lyrics

I was angry with my friend;
I told my wrath, my wrath did end.
I was angry with my foe:
I told it not, my wrath did grow.

And I waterd it in fears,
Night & morning with my tears:
And I sunned it with smiles,
And with soft deceitful wiles.

And it grew both day and night.
Till it bore an apple bright.
And my foe beheld it shine,
And he knew that it was mine.

And into my garden stole,
When the night had veild the pole;
In the morning glad I see;
My foe outstretched beneath the tree.