Snow

Snow is precipitation in the form of flakes of crystalline water ice that falls from clouds.

Since snow is composed of small ice particles, it is a granular material. It has an open and therefore soft, white, and fluffy structure, unless subjected to external pressure. Snowflakes come in a variety of sizes and shapes. Types that fall in the form of a ball due to melting and refreezing, rather than a flake, are hail, ice pellets or snow grains.

The process of precipitating snow is called snowfall. Snowfall tends to form within regions of upward movement of air around a type of low-pressure system known as an extratropical cyclone. Snow can fall poleward of these systems' associated warm fronts and within their comma head precipitation patterns (called such due to the comma-like shape of the cloud and precipitation pattern around the poleward and west sides of extratropical cyclones). Where relatively warm water bodies are present, for example because of water evaporation from lakes, lake-effect snowfall becomes a concern downwind of the warm lakes within the cold cyclonic flow around the backside of extratropical cyclones. Lake-effect snowfall can be heavy locally. Thundersnow is possible within a cyclone's comma head and within lake effect precipitation bands. In mountainous areas, heavy snow is possible where upslope flow is maximized within windward sides of the terrain at elevation, if the atmosphere is cold enough. Snowfall amount and its related liquid equivalent precipitation amount are measured using a variety of different rain gauges.

Melody

A melody (from Greek μελῳδία, melōidía, "singing, chanting"), also tune, voice, or line, is a linear succession of musical tones that the listener perceives as a single entity. In its most literal sense, a melody is a combination of pitch and rhythm, while more figuratively, the term can include successions of other musical elements such as tonal color. It may be considered the foreground to the background accompaniment. A line or part need not be a foreground melody.

Melodies often consist of one or more musical phrases or motifs, and are usually repeated throughout a composition in various forms. Melodies may also be described by their melodic motion or the pitches or the intervals between pitches (predominantly conjunct or disjunct or with further restrictions), pitch range, tension and release, continuity and coherence, cadence, and shape.

Elements

Given the many and varied elements and styles of melody "many extant explanations [of melody] confine us to specific stylistic models, and they are too exclusive." Paul Narveson claimed in 1984 that more than three-quarters of melodic topics had not been explored thoroughly.

Christmas

Christmas or Christmas Day (Old English: Crīstesmæsse, meaning "Christ's Mass") is an annual festival commemorating the birth of Jesus Christ, observed most commonly on December 25 as a religious and cultural celebration among billions of people around the world. A feast central to the Christian liturgical year, it is prepared for by the season of Advent or the Nativity Fast and initiates the season of Christmastide, which historically in the West lasts twelve days and culminates on Twelfth Night; in some traditions, Christmastide includes an Octave. Christmas Day is a public holiday in many of the world's nations, is celebrated culturally by a large number of non-Christian people, and is an integral part of the holiday season, while some Christian groups reject the celebration. In several countries, celebrating Christmas Eve on December 24 has the main focus rather than December 25, with gift-giving and sharing a traditional meal with the family.

Christmas and holiday season

The Christmas season, or festive season, (also called the holiday season or simply the holidays, mainly in the U.S. and Canada), is an annually recurring period recognized in many Western and Western-influenced countries that is generally considered to run from late November to early January, defined as incorporating at least Christmas, and usually New Year, and sometimes various other holidays and festivals. It incorporates a period of shopping which comprises a peak season for the retail sector (the "Christmas (or holiday) shopping season"), and a period of sales at the end of the season (the "January sales"). Christmas window displays and Christmas tree lighting ceremonies when trees decorated with ornaments and light bulbs are illuminated, are traditions in many areas.

Originally within the Roman Catholic Church, the term "Christmas season" was considered synonymous with Christmastide, a term associated with Yuletide, which runs from December 25 (Christmas Day) to January 6 (Epiphany), popularly known as the 12 Days of Christmas. However, as the economic impact involving the anticipatory lead-up to Christmas Day grew in America and Europe into the 19th and 20th centuries, the term "Christmas season" began to become synonymous instead with the traditional Christian Advent season, the period observed in Western Christianity from the fourth Sunday before Christmas Day until Christmas Day itself. The term "Advent calendar" survives in secular Western parlance as a term referring to a countdown to Christmas Day from the beginning of December.

Christmas music

Christmas music comprises a variety of genres of music normally performed or heard around the Christmas season.

History

Early music

Music was an early feature of the Christmas season and its celebrations. The earliest examples are hymnographic works (chants and litanies) intended for liturgical use in observance of both the Feast of the Nativity and Theophany, many of which are still in use by the Eastern Orthodox Church. The 13th century saw the rise of the carol written in the vernacular, under the influence of Francis of Assisi.

In the Middle Ages, the English combined circle dances with singing and called them carols. Later, the word carol came to mean a song in which a religious topic is treated in a style that is familiar or festive. From Italy, it passed to France and Germany, and later to England. Christmas carols in English first appear in a 1426 work of John Audelay, a Shropshire priest and poet, who lists 25 "caroles of Cristemas", probably sung by groups of wassailers, who went from house to house. Music in itself soon became one of the greatest tributes to Christmas, and Christmas music includes some of the noblest compositions of the great musicians.