From my music training I knew that some Spanish rhythms apart 5/4 is a time signature used only in the modern era. Holst's Mars from the Planets is 5/4. But if you speak lines of poetry in that pattern you just end up hitting the off-beats. It's only when you add a rest – a sixth beat – that it sounds as it surely should sound.
The music just tends to be a vehicle for that poetry.
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Religious poetry civic poetry lyric or dramatic poetry are all categories of man's expression which are valid only if the endorsement of formal content is valid.