In the song "revolutionary tea," why do all of the stanzas end with a phrase repeated three times?

Stanzas of the  song  ‘revolutionary tea’ end with a phrase repeating three times because it is based on the format of English country song that uses repetition to improve the quality of the song.

Explanation:

Every stanza of the song ‘revolutionary tea’ has a phrase repeated three times at its end. In the 1750s and early 1760s the British was under severe financial crisis due to several wars. They then decided that the people of the colonies should share some costs.

Taxes were imposed and when people of American colony found it unfair many were repealed after debate and discussion. Finally the only tax that remained was the tea tax. Though it was not a heavy one people revolted against it too. It was on this background the ‘revolutionary tea’ song emerged.

this forms a narrow, steep sided inlet (sometimes deeper than 1300 metres) connected to the sea. the terminal moraine pushed down the valley by the glacier is left underwater at the fjord’s entrance, causing the water at the neck of the fjord to be shallower than the main body of the fjord behind it.