The “Doobidoo for Christmas” books are the result of a collaboration between the composer Otto M. Schwarz and the trombonist and composer Leonhard Paul. Leonhard Paul is known the world over as one of the creative minds behind the ensemble Mnozil Brass. He studied music pedagogy and jazz and is now a lecturer at the University of Music and Performing Arts Vienna (MDW). These books are containing works (Solo Instrument and Piano Accompaniment) in various styles, often equipped with ironic instructions.