piyyut

A piyyuṭ (plural piyyuṭim, ; from ) is a Jewish liturgical poem, usually designated to be sung, chanted, or recited during religious services. Most piyyuṭim are in Mishnaic Hebrew or Jewish Palestinian Aramaic, and most follow some poetic scheme, such as an acrostic following the order of the Hebrew alphabet or spelling out the name of the author.

Many piyyuṭim are familiar to regular attendees of synagogue services. For example, the best-known piyyuṭ may be Adon Olam "Lord of the World." Its poetic form consists of a repeated rhythmic pattern of short-long-long-long (the so-called hazaj meter). It is so beloved that it is often sung after many synagogue services after the ritual nightly recitation of the Shema and during the morning ritual of putting on tefillin. Another beloved piyyuṭ is Yigdal "May God be Hallowed," which is based upon the thirteen principles of faith set forth by Maimonides.