After two years of production he published a CD called “Bonnen spielt …” with organ music of the 20th century.
Beside works of György Ligeti, Paul Hindemith, Charles Ives and Max Reger, he also played compositions written especially for this project and that cannot be performed on conventional organs.
Examples are CDs with music of Frank Zappa, Hildegard von Bingen, Jimi Hendrix, Kurt Weill, Willie Dixon and Claudio Monteverdi.
Concerts in Europe, Asia, South America and especially Russia led to intensive collaborations with foreign artists and to the foundation of the “Russian-German Composers Quartet” with Alexei Aigui and Ivan Glebovich Sokolov from Moscow, Manfred Niehaus and Dietmar Bonnen from Cologne.
Important for his own composing are the works of Johann Sebastian Bach, Jimi Hendrix, Pier Paolo Pasolini, Joseph Beuys and John Cage, whose pieces can be found in many of Bonnen's productions.