The 'beat' of the poem as you called it - the rhythm in which the syllables fall - is more traditionally referred to as the 'meter'. The term meter refers to the basic rhythmic structure in the verse.
If you are looking for an exposition on the specific meter of actual poetry, it is difficult to say without knowing which poem you are thinking of: there is no one meter for the whole of poetry, frequently modern poets adhere to no rigid meter. On the other hand it is quite easy to look at some of the most common 'beats'.
In traditional English poetry, by far the most common meter is 'iambic pentameter'. This is a line consisting of ten syllables (parts of a word - as in 'po-et-ry' = 3 syllables) which is split into five 'iambs' - pronounced "i-ams" (a pair of syllables, not necessarily in the same word, with the stress on the second syllable - as in 'i-AMB').
The iambic pentameter, then, with its five sets of inflected pairs runs like this: da-DUM da-DUM da-DUM da DUM da DUM
- although when reading the poetry you will want to soften the inflection to help convey meaning, the overall rhythmic structure is there.
To see this meter in effect, you can look at the first line of one of Shakespeare's most famous sonnets - Sonnet 18:
'Shall I compare thee to a summer's day?' 'Shall IcomPARE thee TO a SUMMer's DAY?'
I hope that can be of some help.
you are the perfect verse over a tight beat
verse
A five line nonsense verse is known as a limerick
All blank verse has ten syllables per line.
roundlet
A line. Ex: lines 1 through 4 uses internal rhyme
Half a line of verse is called a hemistich. A hemistich is a division of a line of poetry into two parts, often creating a pause or a sense of completion within the line.
A verse is generally considered to be a single line in a metrical composition, e.g. poetry
Rondelet
A Septet
a verse
A line that is repeated at the end of each verse is called as REFRAIN.