Mr. Kyllönen has composed almost 100 compositions: six operas ,The Book of the Kings op.30, Roope op.76, Tango solo op.81, Norppa (The Seal Opera) op.86, Érase que era una niña op.85, The Spirit of Forest op.94, Forgotten Heroes op.98 two symphonies, Lichtenthal (symphonic poem for orchestra op.43), Passio Secularis for soloists, men´s choir,soprano and orchestra op.23 Amor Vivus erotic cycle for bariton and orchestra op.77, Concerto grosso for orchestra op.65, Accordion Concerto op.60, Trumpet Concerto op.84, Marimba Concerto op.96, Roses for soprano and female choir and orchestra op.57, Forgotten Heroes op.98, chamber music, vocal, choral and film music. Mr. Kyllönen´s music has already become established in repertoires of musicians and choirs both in Finland and abroad. Compositions by him has been recorded in Finland by Finlandia-records and Ondine-records, Alba-records and abroad in Japan, Canada, Australia, and Venezuela. In 2008 Alba-records released a new CD with his Orchestral Compositions and Fuga-records a third CD, Sacral Music with his Church Music Compositions.