Couple Ivo and Sofia Kaltchev completed their studies at the University of Music - "Franz Liszt" in Weimar with Prof. Jürgen Rost.
Numerous productions in cooperation with international radio and television stations followed, as well as concerts in over 20 countries.
In addition, both musicians are invited regularly to give masterclasses and take part as jury members at international music festivals.
From 2006 to 2013 they taught at the State University for Music and Performing Arts in Stuttgart, where they were appointed as honorary professors in 2011.
In 2009 (until 2021) Ivo and Sofia Kaltchev took over the artistic direction of the "Aschaffenburger Gitarrentage" and initiated the "International Competition for Chamber Music with Guitar" in Aschaffenburg/ Germany.