The vast majority of the verses of Perek Shirah are biblical, and most of these are from the book of Psalms, but there are also a few verses from the Babylonian Talmud. In modern times, Perek Shirah does not often appear liturgically. However there are many publishers who publish Perek Shirah as a separate entity, anywhere from a wallet-sized booklet to full-sized coffee table books complete with pictures illustrating each of the characters speaking to God.