The earliest notated music of western Europe is Gregorian Chant, along with a few other types of chant which were later subsumed ( or sometimes suppressed ) by the Catholic Church.

* Global Chant Database – Index of Gregorian Chant-online database of plainchant melodies and texts

Semiology, derived from Semeion ( Greek " sign ") is a branch of Gregorian Chant research.

Semiology refers specifically to the study of the neumes as found in the earliest fully notated manuscripts of Gregorian Chant, the oldest of which have been dated to the 9th century.

In 1959, he published The Authentic Rhythm of Gregorian Chant which statedly presented, in edited fashion,

The relative small but growing number of choirs or small groups that perform Gregorian Chant according to these recent developments are thus said to follow the ' semiological approach '.

* The Authentic Rhythm of Gregorian Chant by Dom Gregory Murray, Downside Abbey, Bath, 1959

Besides restoring to prominence Gregorian Chant, he placed a renewed liturgical emphasis on the Eucharist, saying, " Holy Communion is the shortest and safest way to Heaven.

The sense of antiquity is often enhanced when the text is treated psalmodically in a manner resembling Gregorian Chant.

Oriente / Occidente: Gregorian Chant & Qawwali Music.

It also focused on promoting Gregorian Chant.

Many critics regret the general abandonment of the use of the Latin language and Gregorian Chant, and allege that this development was not authorized by the Second Vatican Council.

In addition to the Gregorian Chant music for these, polyphonic compositions exist, some quite elaborate.

Concerned about the allusions to plagiarism, Bob swears that he first thought of the tune after his Army outfit landed in France four years earlier, but guest Al Newman, a music critic, identifies the melody as a 2000-year-old Gregorian Chant.

The printing of music made possible the development of the first truly international musical style since the unification of Gregorian Chant in the 9th century.

* Gregorian Chant for string orchestra ; arrangement of movement III from String Quartet, Op.

* Gregorian covered this on their 2003 album Masters of Chant Chapter IV.

Until approximately 1800, it was possible to hear Gregorian Chant and Renaissance polyphony, such as the music of Palestrina, Lassus, Anerio, and others.

The choristers participated in the 2003 and 2006 International Gregorian Chant Festival in Watou, Belgium and the full choir performed twice at the Oslo International Church Music Festival in March 2006.

Organum is also known to have been performed in several different rites, but the main wells of information concerning its history come from Gregorian Chant.

These innovations are grounded in the forms of Gregorian Chant, and adhere to the theoretical rhythmic systems of St. Augustine.

Today it is also popularly known for a 2008 recording of Gregorian chant: " Chant: Music For Paradise ".

* In April 2008, some of the monks from Heiligenkreuz abbey recorded a CD of Gregorian plainsong, which was released on May 19 on Universal Classics under the title Chant: Music For Paradise ( titled Chant: Music for the Soul in the United States ).

It is common to display the Gregorian calendar in separate monthly grids of seven columns ( from Monday to Sunday, or Sunday to Saturday depending on which day is considered to start the week-this varies according to country ) and five to six rows ( or rarely, four rows when the month of February contains 28 days beginning on the first day of the week ), with the day of the month numbered in each cell, beginning with 1.

However, in order to regard 2000 as the first year of the 21st century according to the astronomical year numbering, the astronomical year 0 has to correspond to the Gregorian year 1 BC.

Hanukkah is observed for eight nights and days, starting on the 25th day of Kislev according to the Hebrew calendar, which may occur at any time from late November to late December in the Gregorian calendar.

Coptic Orthodox Christians celebrate Christmas on 7 January ( Gregorian Calendar ), which coincides with 25 December according to the Julian Calendar.

Their starting point in determining the date of Orthodox Easter is also 21 March, but according to the Julian reckoning, which currently corresponds to 3 April in the Gregorian calendar.

The 14th day of the lunar month according to the Gregorian system is only the 9th or 10th day according to the Julian.

* 1918 – The Soviet Union adopts the Gregorian calendar ( on 1 February according to the Julian calendar ).

By 1704 the Julian calendar was eleven days behind the Gregorian, and the siege thus began on 21 July according to the Julian.

In the Coptic Orthodox Church of Alexandria, he is commemorated, according to its Synaxarium, on the 24th of the Coptic Month of Kiahk ( which currently falls on January 2, but is equivalent to December 20 in the Gregorian Calendar due to the current 13-day Julian-Gregorian Calendar offset ).

It is also known as the " November Revolution " having occurred in November according to the Gregorian Calendar.

Sts Cyril and Methodius ' feast day is currently celebrated on 14 February in the Roman Catholic Church ( to coincide with the date of St Cyril's death ); on 11 May in the Eastern Orthodox Church ( though note that for Eastern Orthodox Churches still on the Julian Calendar or ' old calendar ' this is 24 May according to the Gregorian calendar ); and on 7 July according to the old sanctoral calendar that existed before the revisions of the Second Vatican Council.

* December 24 ( Julian Calendar ; January 3, 1602 according to the Gregorian Calendar used by the Irish and Spanish forces in the battle ) – The Battle of Kinsale ends the siege of Kinsale, Ireland ( begun in autumn 1601 ).

* January 3 – Battle of Kinsale: The battle happened on Thursday, 3 January 1602 according to the Gregorian Calendar used by the Irish and Spanish forces in the battle, although, for the English who were still using the old Julian Calendar, the date of the battle was Thursday, 24 December 1601.

So the end date is always calculated according to the Gregorian calendar, but the beginning date is usually according to the Julian calendar ( or occasionally the Proleptic Gregorian calendar ).

2003 ( MMIII ) was a common year that started on a Wednesday, according to the Gregorian calendar.

Later, the Catholic Church established a fixed way of calculating Easter according to the Julian ( and later the Gregorian ) calendar.

An unofficial but widely followed memorial date is 4 November, the date according to the Gregorian calendar.

The majority of Orthodox Christians ( Russians, in particular ) follow the Julian Calendar in calculating their ecclesiastical feasts, but many ( including the Ecumenical Patriarchate and the Church of Greece ), while preserving the Julian calculation for feasts on the Paschal Cycle, have adopted the Revised Julian Calendar ( at present coinciding with the Gregorian Calendar ) to calculate those feasts which are fixed according to the calendar date.