Overly serious pieces without humor can be very good, but usually you want to have a little natural humor mixed in. Usually, you want to pick prose that has a first person perspective for the narrator. Click here to see a list of online links to find literature online. Many literary journals are completely online. Some have only samples online.
Many bookstores have anthology sections.
Some even have the literary journals in a separate section in the magazine area. Good prose can also come from novels and autobiographies, sometimes even newspaper articles. Play cutting are prohibited. Use of manuscript is required. Some poetry is just too dense to understand when you listen to it once.