As a recitalist and chambermusician Karel performed at numerous festivals like the the Dordrecht Cellofestival, the Amsterdam Cellobiënnale, the Orlando Festival, the Accademia Musicale Chigiana Siena, the Styrian Chamber Music festival, IMS Prussia Cove, the Whittington chamber music festival, the Festival Internationale da Musica da Camera da Cervo, the Amerfortissimo festival and the Schleswig-Holstein Musik Festival. In these festivals Karel worked together with musicians such as Midori, Gustav Rivinius, Jean Sulem, Ulf Hoelscher, Li-Wei Qin, Erich Oskar Huetter, Paul Rosenthal, Christiaan Bor, Ian Fountain, Herman van Veen and Carel Kraayenhof.
With his former string quartet "En-Accord", Karel won several prizes and was coached by quartetmusicians such as Sandor Devich (Bartók Quartet), Milan Skampa (Smetana Quartet), Martin Lovett (Amadeus Quartet), Ferdinand Erblich (Parkanyi Quartet), Earl Carlyss (Juilliuard Quartet), Tim Vogler (Vogler Quartet), Alain Meunier (Conservatoire de Paris), Thomas Brandis (Brandis Quartet), Hugh Maguire (Allegri Quartet) and Valentin Berlinsky (Borodin Quartet).
Karel currently plays at the Cello8ctet Amsterdam, is a member of Cuarteto Soltango, performs regularly with Spira Mirabilis and is founder and artistic director of the Cervo Chamber Music festival in Cervo, Italy.
Rachmaninov Sonata - Allegro Moderato Sofja Gülbadamova, Piano
Rachmaninov Sonata - Allegro Scherzando Sofja Gülbadamova, Piano