Cellist Sebastian Bertoncelj comes from a musical family in Domžale, where he has spread his musical creativity throughout Europe.  

He has performed in concert with the Slovenian Philharmonic Orchestra, RTV Slovenia, the Academy of Music and the Bled Festival, collaborating with conductors Uroš Lajovic, Philipp von Steinaecker, En Shao, Loris Voltolini, Simon Dvoršak, Zoran Bičanin and Nenad Firšt. Solo performances within the Music Youth of Ljubljana, Music Youth of Slovenia, Castle Harmonies, Velenje Festival, Lent Festival, Nei Suoni dei Luoghi Festival, Teatro Bon, etc. These are complemented by an intense dedication to chamber music - we should mention the collaboration with musicians such as Boštjan Lipovšek, Jerica Pavli, Emile Cantor, Mark Gothoni, Emma Steele, Solenne Païdassi, Aylen Pritchin, Thomas Carroll, Christopher Tun Andersen, Lorenzo Cossi, Wonji Kim Ozim, and Luz Leskowitz at festivals in Slovenia, Italy, Austria, Germany, Switzerland, the Czech Republic and Poland.In addition, we have also participated in festivals in the Czech Republic, Germany, Germany, Italy, Poland, and the Czech Republic. 

In addition to his studies with Prof. Miloš Mlejnik at the Ljubljana Conservatory and Academy of Music, Sebastian studied for many years in Stuttgart with Conradin Brotbek, Lucerne with Christian Poltéri and in Salzburg with Enrico Bronzi. 

In addition to numerous first prizes at national and international competitions, he is also the recipient of the Prešeren Prize of the Academy of Music, the Yamaha Music Fund Prize and the bronze plaque of the Municipality of Domžale for his achievements in the field of culture. 

He has been committed to teaching since 2016 - first as a tutor in masterclasses "Ars longa, vita brevis" and the package "ArSensei", and currently teaches young cellists at the Maribor Conservatory, the Celje Artistic Gymnasium and the Slovenska Bistrica Music School, and is an assistant professor at the Academy of Music, University of Ljubljana; he is also teaching at the Gustav Mahler University in Klagenfurt for the 2021/22 academic year.