About us

Music In All is a music education collaboration between Katja Maria Slotte and Jeanne Schmartz.

We do workshops and professional development courses, coach teachers, write handbooks for people who teach singing and music, create new teaching materials, develop music education projects and give school concerts.

We teach both separately and together. Our working languages are: English, Dutch, Finnish, Swedish, French, German, and Luxembourgish.

We are both active as musicians and teachers, and have trained and worked internationally among others in The Netherlands, Finland, Denmark, Estonia, Scotland, Germany, Canada, and Luxembourg. We have taught music for all ages, from babies to grown-ups, from beginners to professionals, in various settings ranging from individual lessons to school classes, choirs, bands and big groups of people.


©2012 Keke Keukelaar


• Singer, musician, vocal coach, music educator (BMus, MMus)
• Authorised Complete Vocal Technique (CVT) Teacher
• Originally from Finland, nowadays based in The Netherlands
• Read more about Katja






• Musician, music teacher, musicologist, music editor (BMus, MA)
• Based in Luxembourg
• Read more about Jeanne





If you wish to discuss any training opportunities, please call us and we will be more than happy to assist you with your enquiries.

+31 (0)6 4176 3176 (Katja / The Netherlands)

+352 621402271 (Jeanne / Luxembourg)

Alternatively, you can send us a message via the contact form on this page.