How does the repotion of the word singing influence the overall meaning of the poem i hear singing

Assuming that your question refers to the poem I Hear America Singing by Walt Whitman, 1819-1892, in which the word singing is repeated, this influences the overall meaning by giving it rythm, making it gentle and beautiful,depicting the beautiness of a normal avergae day for most people in which they spontaneausly sing while their are working and doing their daily activities.

the difference between an explicit and implicit meaning is that the explicit meaning of a poem is that the detail is exactly defined. nothing is left to interpretation. an implicit meaning is an implied meaning. kabir's poetry is both explicit and implicit in that it can be interpreted on different levels. the explicit meaning leaves nothing to interpretation while the implicit meaning leaves lots open to interpretation. an example of this is found in the poem "rumi and the spiritual lover". 

the pronoun reference replaces a noun, but you have to make sure there's no room for confusion.

in the first sentence "her" could be referring to shely or to the sister. the answer there is "shelly called her sister and told her about the new baby."

in the second sentence "it" could be referring to the roof or the floor. the answer there is "since the roof leaks on the family room floor, we need to repair the roof."