He is composing since his childhood. After his first unfinished attempts (a
piano concerto and a
symphony), his gradual conversion to
Catholicism led him to realise that his role in life would be to lift church music up. Thus confined, his creation and activities have touched upon all music forms, and his work has given birth to a very distinctive original musical world. His first finished work, the Missa Solemnis (1986), ranks among the most performed contemporary vocal-instrumental pieces (more than fifty performances, including one in
Carnegie Hall, in 1999, and on Prague's
St Vitus and Adalbert Cathedral, in 2015). It was followed by several smaller pieces: the Missa Brevis in E flat major (1987) and Missa Brevis in F sharp major (1988, rev. 2003), as well as many smaller works intended to accompany the liturgy, from festive mass songs (Lord, Have Mercy, 1996; Alleluia, Be Alive, 2007; I Believe in One Church, 2008...), through original adaptations of psalms and hymns (Hymn to the Holy Spirit, 2005; De Profundis, 2009; Psalm 131, 2010; Magnificat, 2011), cycles of Christmas carols (Symphonic Carols, 1998; Dreamy Carols, 2006), up to Choir songs for the Nový Dvůr
Trappist monastery (2001). His monumental Credo in F Sharp Minor (2006) also has to be pointed out, whose length exceeds the regular framework of the mass rites and constitutes the composer's personal confession. In a personal letter from 2006,
Pope Benedict XVI has highlighted the quality and the conversional effect of Bok's music. In 2015, the Czech Bishops’ Conference has awarded Bok for his church music and his activities for the Catholic Church. The apex of his work is his trilogy of oratorios for soli, children's and mixed choirs, organ and symphonic orchestra. The first of these oratorios is The Gnomes of the Valley of Křinice (1993) which was greeted by success at the author's graduating concert for the end of his conducting studies in Prague's
Rudolfinum Hall. It was followed by Saint Zdislava (2001). The last oratorio is The Apocalypse on the Slopes of Kamenice, whose first part Bok has been performed with success in 2016 by world renowned conductor
Manfred Honeck with the
Czech Philharmonic in Prague's Rudolfinum Hall. The whole trilogy of oratorios constitutes a completely new and modern kind of spiritual composition. Formally, they combine a grandiose sonata layout with a principle of individual attacca sections whose titles and abstract text by the composer himself guide the listener's imagination. Bok's unique trilogy of oratorios, permeated with autobiographic elements, is a great meditation on death, the sensation of the upcoming apocalypse, as well as a celebration of the Roman Catholic Church. One of the important aspects of Bok's work is its link to the spiritual and cultural geography of Northern and Western Bohemia, regions that have been drastically scarred by
historic events damaging their social and cultural relationships. Bok has thus composed many original church pieces for chamber brass ensembles with organ (Symphonic Fanfares, 1999; Vakovian Litany, 2002; Funeral Music, 2008...), each of which is dedicated to a precise place. This is also the case for his piano fugues on postal codes of several parishes, for instance. He is active in these regions as conductor and prolific organiser of the local musical life, as witnessed by the fact that he has been performing the classic
Czech Christmas Mass by
Jan Jakub Ryba there for more than thirty years, as well as many other spiritual works (
Mozart,
Beethoven,
Liszt,
Dvořák etc.). Another distinctive characteristic of Bok's work is the fact that most of his compositions exist in various versions: for orchestra, for chamber ensembles, for organ, for piano etc. This has come to be to facilitate performances, but often also on demand of many an interpreter, for whom Bok has elaborated various arrangements of parts of his spiritual works (Small Suite for five trombones, tuba and timpani, 2006; Chamber Carols for flute, trumpet, timpani, organ and string quartet with
double bass, 2007; Křinice Suite for horn and string quartet, 2008 etc.). For some of his friends, he has also elaborated many arrangements and orchestrations either of their own works (Jaroslav Novák, Jaroslav Pelikán,
Václav Krahulík,
Jean-Gaspard Páleníček) or of works by great composers of the past (orchestration of
J. Brahms’ Trio in E Flat Major Op. 40 or of
A. Bruckner’s
Motets and movements of symphonies, arrangements for wind ensemble of L. van Beethoven’s and
J. Haydn’s string quartets, most of which commissioned by world renowned hornist and conductor
Radek Baborák). Most notably, In 2017, the
Czech Olympic Committee commissioned a new arrangement of the
Czech national anthem from Bok and, in 2018, world renowned conductor and pianist
Daniel Barenboim commissioned an arrangement of
Bach’s Chaconne for an ensemble of brass instruments from him. Bok’s original film scores for director
Jiří Strach is a whole different chapter and has often served as a preparatory laboratory for more personal compositions. == Works ==