It's best to rhyme, including many abortion songs now. If the lyrics rhyme, it will be more natural and smooth to sing. Most modern poems in the history of literature now rhyme. However, this rhyme is different from the strict rhyme in ancient poetry, as long as we can roughly pay attention to the rhyme at the end of each section.
Modern poetry that doesn't rhyme is ok, but unless you write it really well, modern poetry that doesn't rhyme is a bit difficult to read.