 In the music production domain, he is part of the music formation Symphonix or Symphonix International, a musical production and events project, mostly active in Austria, Bulgaria and the United Kingdom.Borislav "Boby" Milanov is the CEO with the other members being Johan Alkenäs, Joacim Persson and Cesár Sampson himself.Symohonix has been involved in launching of a number of songs particularly for Eurovision Song Contest including "Dance Alone" by Macedonian singer Jana Burčeska, "Bones" by Bulgarian band Equinox, "Beautiful Mess" by Bulgarian singer Kristian Kostov and Cesár Sampson's own entry for Austria "Nobody but You".