Wikipedia
Pizmonim
Pizmonim ( Hebrew פזמונים, singular pizmon) are traditional Jewish songs and melodies sung with the intention of praising God as well as learning certain aspects of traditional religious teachings. They are sung throughout religious rituals and festivities such as prayers, circumcisions, bar mitzvahs, weddings and other ceremonies.
Pizmonim are extra-liturgical, as distinct from piyyutim, which are hymns printed in the prayer-book and forming an integral part of the service. Similar songs sung in the synagogue on the Sabbath morning between midnight and dawn are called baqashot (שירת הבקשות).