As part of his pedagogic activities, since 1999, he is leading the Western Bohemia St Cecilia Sinfonietta, an ensemble formed of students of Karlovy Vary’s elementary and music schools in which he had been teaching during the years 1999–2016.
The first of these oratorios is The Gnomes of the Valley of Křinice (1993) which was greeted by an enormous success at the author's graduating concert for the end of his conducting studies in Prague's Rudolfinum Hall.
The last oratorio is The Apocalypse on the Slopes of Kamenice, whose first part Bok has been performed with great success in 2016 by world renowned conductor Manfred Honeck with the Czech Philharmonic in Prague's Rudolfinum Hall.
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.
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.
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,[29] as well as many other spiritual works (Mozart, Beethoven, Liszt, Dvořák etc.).
40 or of A. Bruckner’s Motets and movements of symphonies,[32][33] 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).