Question: What American composer of classical music and opera, with strong roots in minimalism, composed Grand Pianola Music?

Context paragraphs:
John Adams (composer): John Coolidge Adams (born February 15, 1947) is an American composer of classical music and opera, with strong roots in minimalism.

Holy minimalism: Holy minimalism, mystic minimalism, spiritual minimalism, or sacred minimalism are terms, sometimes pejorative, used to describe the musical works of a number of late-twentieth-century composers of Western classical music.  The compositions are distinguished by a minimalist compositional aesthetic and a distinctly religious or mystical subject focus.

List of classical music festivals: The following is an incomplete list of classical music festivals, which encapsulates music festivals focused on classical music.  Classical music is art music produced or rooted in the traditions of Western music (both liturgical and secular), and has long been played at festival-like settings.  It encompasses a broad span of time from roughly the 11th century to the present day.  The major time divisions of classical music are as follows: the early music period, which includes the Medieval (500–1400) and the Renaissance (1400–1600) era, played at early music festivals; the common practice period, which includes the Baroque (1600–1750), Classical (1750–1830), and Romantic eras (1804–1910), which included opera festivals and choral festivals; and the 20th century (1901–2000) which includes the modern (1890–1930) that overlaps from the late 19th-century, the high modern (mid 20th-century), and contemporary classical music festivals or postmodern (1975–2000) eras, the last of which overlaps into the 21st-century.  The term "classical music" did not appear until the early 19th century, in an attempt to distinctly canonize the period from Johann Sebastian Bach to Beethoven as a golden age.

Grand Pianola Music: Grand Pianola Music is a minimalist composition by American composer John Adams.  It was written in 1982 and premiered by the San Francisco Symphony in San Francisco's Japan Center.

Classical music in Kosovo: Classical music in Kosovo refers to the art music cultivated in Kosovo.  The roots of classical music in Kosovo are found in the 1940s and include the time period from the times when Kosovo was part of Yugoslavia to this day.  It can be said that there is a tradition of classical music in Kosovo, however, compared to other Balkan countries and especially European countries this tradition is younger.  Classical music in Kosovo reaches back about 70 years.  Even though in a short period of time, this music has evolved, passing through generations of composers and artists.  In his book "Zhvillimi i stileve në veprat e kompozitorëve shqiptarë të Kosovës", Engjëll Berisha comments:

Tim Brady: Timothy Wesley John Brady (born 11 July 1956) is a Canadian composer, electric guitarist, improvising musician, concert producer, record producer and cultural activist.  Working in the field of contemporary classical music, experimental music, and "musique actuelle", his compositions utilize a variety of styles from serialism to minimalism and often incorporate modern instruments such as electric guitars and other electroacoustic instruments.  His music is marked by a synthesis of musical languages, having developed an ability to use elements of many musical styles while retaining a strong sense of personal expression.  Some of his early recognized works are the 1982 orchestral pieces "Variants" and "Visions", his "Chamber Concerto" (1985), the chamber trio "...in the Wake..." (1985, 1988), and his song cycle "Revolutionary Songs" (1994).

Rain Worthington: Rain Worthington is an American composer of classical music.  Her influences include world music, minimalism, and romanticism.  Writing in "Chamber Music" magazine, Kyle Gann said "...her music takes ideas of American musical style to a new place - like a walk in a familiar, yet very different park... And isn't afraid to come up with its own startling conclusions."  The music journalist Bob Briggs noted, "...she writes music which speaks to the senses, is packed with real emotion and, most important of all in contemporary music, really communicates."  She has been awarded grants from Meet The Composer, ASCAP, the American Music Center, NYFA, and the American Composers Forum.  Worthington also serves as Artistic Administrator and Composer Advocate for the New York Women Composers.

Kasia Glowicka: Kasia Glowicka (born Katarzyna Glowicka, October 12, 1977), also known as Katarina Glowicka, is an award-winning Polish composer and lecturer of computer music at the Royal Conservatory of Brussels.  Her compositions span a range of styles in experimental, minimalism, Avant-garde, art music and contemporary classical music genres, written for orchestra, small ensembles, or solos and often accompanied by electronic music.  She has also composed scores for opera, theater, ballet and film.  In 2004 she married composer Henry Vega and they reside in the Netherlands.  They are founding directors of the Artek Foundation and its recording label, ARTEKsounds.  Glowicka's scores are published by the Dutch institute Donemus.

Musical composition: Musical composition can refer to an original piece of music, either a song or an instrumental music piece, the structure of a musical piece, or the process of creating or writing a new song or piece of music.  People who create new compositions are called composers in classical music.  In popular music and traditional music, the creators of new songs are usually called songwriters; with songs, the person who writes new words for a song is the lyricist.  "Composition" is the act or practice of creating a song or other piece of music.  In many cultures, including Western classical music, the act of composing typically includes the creation of music notation, such as a sheet music "score", which is then performed by the composer or by other instrumental musicians or singers.  In popular music and traditional music, songwriting may involve the creation of a basic outline of the song, called the lead sheet, which sets out the melody, lyrics and chord progression.  In classical music, orchestration (choosing the instruments of a large music ensemble such as an orchestra which will play the different parts of music, such as the melody, accompaniment, countermelody, bassline and so on) is typically done by the composer, but in musical theatre and in pop music, songwriters may hire an arranger to do the orchestration.  In some cases, a pop or traditional songwriter may not use written notation at all, and instead compose the song in her mind and then play, sing and/or record it from memory.  In jazz and popular music, notable sound recordings by influential performers are given the weight that written or printed scores play in classical music.

Griogair Labhruidh: Griogair Labhruidh (born 24 October 1982) is a Scottish Gaelic poet, musician, and Hip Hop producer/MC with strong roots in the Gaelic tradition of Baile Chaolais (Ballachulish) in the Scottish Highlands.  After many years recording the Gaelic traditions of his local area, Gaelic became his dominant language and he is one of the only musicians who can speak a mainland Gaelic dialect, rather than the standard Hebridean Gaelic.  Well-versed in the ceòl mòr piping tradition of his own homeland, Labhruidh is a member of the Afro-Celt Sound System and has produced Gaelic music in nontraditional genres, such as hip-hop and fusion.  In 2014, Labhruidh became the main vocalist for the Gaelic supergroup Dàimh.  He was Gaelic Singer of the Year at the MG Alba Trad Music Awards of 2015.  Labhruidh is planning to release a Hip Hop album by the end of 2017, writing, recording and producing the first fusion album of its kind.

Supporting paragraphs: Grand Pianola Music John Adams (composer)
Answer: John Adams