Merel Martens

After two bachelor’s degrees in Music Teaching and Choir Leading Pop & Jazz, Merel received a Master’s degree in ‘Vocal Leadership’ from RAMA in May 2015. Merel’s name is connected to the award winning vocal groups Pitch Control, MAZE, The Junction, Dutch Organic Choir and VOÏSZ Vocal Projects, all located in the Netherlands.  Merel regularly travels to international vocal festivals for workshops, ateliers and concerts.

Glenn Liebaut

As an all round percussionist, Glenn always combined world percussion with his Bachelor and Master studies off classical percussion at the Conservatory of Amsterdam. Since his study he has been active as a freelance percussionist in a diversity of classical orchestra’s, ensembles and percussion bands. In his master research he specialized in inner and outer rhythm, how to lead and follow puls and rhythm. On the educational field he developed the project ‘Doe je ritmix’, rhythm and movement as a base for music education.

Marlou Vriens

Marlou’s methodology is about Vocal Integration, awareness, skill and musicality. She also runs girls choir Out of the Blue (Gouda). Marlou also composes for choir, theatre and dance performance. Her last piece was nominated for the Årets Reumert awards (Denmark). With her band Marlou she released her debut album Long way home, which was well reviewed in OOR magazine.

Line Groth Riis

Line Groth is known for her great arrangements for the world famous Danish choir, Vocal Line. She’s a Singer, arranger and composer in the vocal group Postyr (DK). Line holds a Master’s degree in Singing and Choir Conducting from The Royal Academy of Music, Aarhus. She has been teaching choirs, singers and conductors all over Europe, in the US, Israel, Greenland and Taiwan for over a decade.

Mathieu Vulto

Mathieu Vulto is specialist in music education at primary schools, choir conductor, jazz singer (scat) and freelance jazz flugelhorn player. He graduated in the separate bachelors Wind and Brass Band Conducting (HaFaBra), Classical Flugelhorn and Music Education at the academy of music in Alkmaar and Amsterdam. Recently he graduated for his master’s degree (MMus) in Innovative Choir Conducting at the Royal Academy of Music in Aalborg, Denmark. He gives lectures as a guest teacher in music education around the country and beyond and is lecturer at Stenden University. Mathieu developed his own philosophy in music education, called Co-Creative Classrooms.

Freek Koopmans

After bachelor’s degrees in both elementary education and music education, Freek started working as a drummer for Percossa and Lieve Bertha. With these two bands he’s currently touring in- and outside the Netherlands. Additionally, Freek is still a music teacher in elementary school and one of the writers/editor of the music method ‘Metropole op school’ for the Metropole Orchestra.

Bouke Sleurink

Bouke studied at ArtEZ Zwolle and has a bachelor degree in music education. After his study he started working at several secondary schools as a music teacher. He has played piano and keyboard in various formations. He is also active as a choir leader and songwriter. Recently he finished the 2-year course Vocal leadership and he is very much inspired to help students improve their piano playing skills.

Syd Horster


At primary school it quickly became clear that music would be the path Syd had to take. He has been playing the piano since he was 7 years old and started to explore singing when he was at the ‘Havo for Music and Dance’. Today making music, educating and inspiring people is what makes Syd happy.

Jeroen Zijp

Jeroen studied at HKU and has a Bachelor’s degree in Composition and Music Production. After this study Jeroen has composed for various music theater shows. By combining modern and contemporary technology with choir singing, Jeroen creates a new fresh sound. With his broad knowledge and innovative ideas, he takes the concept of choral music into the 21st century. The use of technology to deepen choral singing is a relatively new trend, in which Jeroen can be seen as a real trendsetter.

Stephanie Kramer

Stephanie Kramer is an expert in creating and guiding vocal improvisation in the classroom and expanding the student’s musical comfort zone. Stephanie finished her Masters’s degree in Rotterdam and is specialized in working with children and youngsters in primary and secondary school. Stephanie in known for her methodology as described in her book ‘De muzikale speeltuin’ and gives workshops to music teachers in the Netherlands and Belgium. Stephanie is also active as a singer, choir leader, music teacher, coach and cultural entrepreneur.

Julian Knoerzer

Julian is a musician and singing enthusiast from Freiburg, Germany. Julian sings in the band Unduzo and is a conductor for a number of choirs, zuch as the JazzPop Choir Tübingen. He is also known for his beatboxing, and he has published the book “Beatbox Your Choir”.

Rolinde Zieverink

Rolinde has successfully led several classical choirs, pop choirs, rock choirs, gospel choirs and a-capella groups. Her broad musical background in classical music as well as pop and jazz ensures a thorough and versatile approach within Sonic Vox, her professional Dutch Contemporary Choir. She completed the master’s degree in Vocal Leadership at Codarts, where she now also works as a teacher.

(Previous) guest teachers

(Previous) guest teachers include Rohan Poldervaart, Jasper van Oerle, Jim Daus Hjernoe, Peder Karlsson, Signe Sorensen, Line Groth, James Rose, Marleen de Boo, Henk Kraaijeveld, Rabih Lahoud and more!