Kalir, the founder of the payyetanic style, perhaps in the 7th century; Saadia Gaon; the Spanish school, consisting of Joseph ibn Abitur (died in 970), ibn Gabirol, Isaac Gayyath, Moses ibn Ezra, Abraham ibn Ezra and Judah ha-Levi, Moses ben Nahman (Nahmanides) and Isaac Luria; and the Ashkenazic and French schools including Shimon bar Yitzchak, Meir bar Yitzchak and many others The Ari recited only early piyyutim, such as those by Eleazar Kalir, but did not like the sephardic piyyutim. Therefore, on holidays he would daven with Ashkenazim - as opposed to his practice the rest of the year to daven with sephardim - in order to recite their piyyutim which include many more earlier piyyutim. For this reason, many Chasidim (such Belz and Viznitz) recite many piyyutim on Yom Tov and the sabbaths of the four special portions preceding Passover in accordance with the practice of the Ari. However, in Sephardic communities which accepted most of the practices of the Ari, they never accepted the Ashkenazic piyyutim. Complete and weekday siddurim Some siddurim have only prayers for weekdays; others have prayers for weekdays and Shabbat. Many have prayers for weekdays, Shabbat, and the three Biblical festivals, Sukkot (the feast of Tabernacles), Shavuot (the feast of weeks) and Pesach (Passover). The latter are referred to as a Siddur Shalem ("complete siddur"). Variations and additions on holidays There are many additional liturgical variations and additions to the siddur for the Yamim Noraim (The "Days of Awe"; High Holy Days, i.e. Rosh HaShanah and Yom Kippur). As such, a special siddur has developed for just this period, known as a mahzor (also: machzor). The mahzor contains not only the basic liturgy, but also many piyyutim, Hebrew liturgical poems. Sometimes the term mahzor is also used for the prayer books for the Three Pilgrimage Festivals, Pesach, Shavuot and Sukkot. On Tisha b'Av, a special siddur is used that includes the text of the Book of Lamentations, the Torah and Haftarah readings for that day, and Kinnot or special mournful piyyutim for that day. This siddur is usually called "Kinot" as well. Traditionally, every year many Jews hope that the Messiah will come and the Third Temple will be rebuilt, so Tisha b'Av will not happen again. So after the fast ends, many traditions place their Kinot siddurim in a geniza, or a burial place for sacred texts. Popular siddurim Below are listed many