Sing a poem in tune.

This is much more, and the ancient folk songs in the south are of this type.

Ancient times: songs of the Western Zhou Dynasty and midnight songs. A lot of things can't be remembered at the moment. I suggest you search "Folk Songs of Southern Dynasties", all of which are soft and beautiful.

Modernity: Both Xu Zhimo's and Lin's poems have this feature. Go to "China Poetry Library". There are their masterpieces in it.