Sacred music in the context of "Western Classical music"

Secular music and sacred music were the two main genres of Western music during the Middle Ages and Renaissance era. The oldest written examples of secular music are songs with Latin lyrics. However, many secular songs were sung in the vernacular language, unlike the sacred songs that followed the Latin language of the Church, which is not to say there are not secular songs in Latin or not secular songs that are religious in theme.

In the Middle Ages, and even through the Renaissance and the Age of Enlightenment, any music that was not commissioned by the Catholic Church (or, later, a Protestant church) for liturgical use was and still is considered "secular music." Symphony No. 9 (Beethoven) (commonly called "Ode to Joy") and Messiah (Handel) are both examples of secular music because, despite being wholly and innately religious in theme, they were not commissioned by any church or for use in any religion's liturgy. Symphony No. 9 was commissioned by the Philharmonic Society of London for theater performance, not by the Catholic Church, the Church of England, or any other church and not for liturgical use. Likewise, "Messiah (Handel) was commissioned by the Duke of Devonshire to be performed in Dublin theaters for a series of charity concerts, not by the Catholic Church or any other church and not for liturgical use. So, while "secular" today is often taken to mean non-religious in any way, when it refers to music from the Middle Ages through as late as the 19th century, music with a religious theme may be and very often is "secular music" for the simple fact that it was not written on behalf of any commissioning church or for liturgical use, meaning "secular" does not indicate that it is thematically non-religious but that it is non-religious vis-à-vis a religious organization (i.e., the Church) did not commission its creation, sacred music being definitively music commissioned by the Church for liturgical use, for use by the Church in the Church's established rituals, the Church's ceremonies, and the Church's forms of worship, and any and all other music (i.e., music not fitting that strict definition) being secular music, no matter how religiously themed or gloriously worshipful of God it may be. A caveat: while these definitions of sacred music and secular music still hold true today when referring to such music from the past, they tend not to still hold true today for more modern music as any modern song that is themed in religious worship, regardless of if any church commissioned it or uses it in its liturgy, is not considered secular music, like Christian rock is not considered secular music today, but if it were somehow packed up and sent back to the 1500s, it would be considered secular music today because it would have been considered secular music back in the 1500s because of not being commission by the Church for liturgical use but by the artists themselves, or their labels, for their own personal or professional use and so would have come down through history to today as secular music.

Classical music generally refers to the art music of the Western world, considered to be distinct from Western folk music or popular music traditions. It is sometimes distinguished as Western classical music, as the term "classical music" can also be applied to non-Western art musics. Classical music is often characterized by formality and complexity in its musical form and harmonic organization, particularly with the use of polyphony. Since at least the ninth century, it has been primarily a written tradition, spawning a sophisticated notational system, as well as accompanying literature in analytical, critical, historiographical, musicological and philosophical practices.

Rooted in the patronage of churches and royal courts in Europe, surviving early medieval music is chiefly religious, monophonic and vocal, with the music of ancient Greece and Rome influencing its thought and theory. The earliest extant music manuscripts date from the Carolingian Empire (800–887), around the time which Western plainchant gradually unified into what is termed Gregorian chant. Musical centers existed at the Abbey of Saint Gall, the Abbey of Saint Martial and Saint Emmeram's Abbey, while the 11th century saw the development of staff notation and increasing output from medieval music theorists. By the mid-12th century, France became the major European musical center: the religious Notre-Dame school first fully explored organized rhythms and polyphony, while secular music flourished with the troubadour and trouvère traditions led by poet-musician nobles. This culminated in the court-sponsored French ars nova and Italian Trecento, which evolved into ars subtilior, a stylistic movement of extreme rhythmic diversity. Beginning in the early 15th century, Renaissance composers of the influential Franco-Flemish School built on the harmonic principles in the English contenance angloise, bringing choral music to new standards, particularly the mass and motet. Northern Italy soon emerged as the central musical region, where the Roman School engaged in highly sophisticated methods of polyphony in genres such as the madrigal, which inspired the brief English Madrigal School.

Medieval music encompasses the sacred and secular music of Western Europe during the Middle Ages, from approximately the 6th to 15th centuries. It is the first and longest major era of Western classical music and is followed by the Renaissance music; the two eras comprise what musicologists generally term as early music, preceding the common practice period. Following the traditional division of the Middle Ages, medieval music can be divided into Early (500–1000), High (1000–1300), and Late (1300–1400) medieval music.

Medieval music includes liturgical music used for the church, other sacred music, and secular or non-religious music. Much medieval music is purely vocal music, such as Gregorian chant. Other music used only instruments or both voices and instruments (typically with the instruments accompanying the voices).

Tomás Luis de Victoria (sometimes Italianised as da Vittoria; c. 1548 – c. 20–27 August 1611) was the most famous Spanish composer of the Renaissance. He stands with Giovanni Pierluigi da Palestrina and Orlande de Lassus as among the principal composers of the late Renaissance, and was "admired above all for the intensity of some of his motets and of his Offices for the Dead and for Holy Week". His surviving oeuvre, unlike that of his colleagues, is almost exclusively sacred and polyphonic vocal music, set to Latin texts. As a Catholic priest, as well as an accomplished organist and singer, his career spanned both Spain and Italy. However, he preferred the life of a composer to that of a performer.

The Mass (Latin: missa, Italian: messa, French: messe, German: Messe) is a form of musical composition that sets the invariable portions of the western Christian Eucharistic liturgy (principally that of the Catholic Church, the Anglican Communion and Lutheranism) known as the Mass.

Most Masses are settings of the liturgy in Latin, the sacred language of the Catholic Church's Roman Rite, but there are a significant number written in the languages of non-Catholic countries where vernacular worship has long been the norm. For example, there have been many Masses written in English for a United States context since the Second Vatican Council, and others (often called "communion services") for the Church of England.