Isidora Žebeljan studied composition at the Faculty of Music in Belgrade with Vlastimir Trajković (a student of Olivier Messiaen).
Isidora Žebeljan received commissions from notable institutions and festivals, such as: She composed works for notable musical ensembles, such as the Wiener Symphoniker, The Academy of St. Martin in the Fields, the Brodsky Quartet, Berlin Philharmonic Octet, Dutch Chamber Choir and London Brass.
Among the ensembles and musicians who performed music of Isidora Žebeljan are the Gothenburg Symphony Orchestra, Symphony Orchestra of RAI Torino, Real Filharmonía de Galicia, Janáček Philharmonic Orchestra, I Solisti Veneti, Neue Philharmonie Westfalen, No Borders Orchestra, Lutosławski Quartet, Nieuw Ensemble (Amsterdam), Zagros Ensemble (Helsinki), ensemble Sentieri Selvaggi (Milan), conductors Paul Daniel, Claudio Scimone, David Porcelijn, Christoph Poppen, Pierre-André Valade, pianists Kyoko Hashimoto and Aleksandar Madžar, hornist Stefan Dohr, clarinetists Joan Enric Lluna and Alessandro Carbonare, violinist Daniel Rowland and others.
She conducted concerts in London (with The Academy of St Martin in the Fields) and in Amsterdam (Muziekgebouw aan 't IJ), and performed as a pianist with the Brodsky Quartet.
In 2017, Isidora Žebeljan signed the Declaration on the Common Language of the Croats, Serbs, Bosniaks and Montenegrins.
In 2015 the same label released a CD with her chamber music for strings, played by the Brodsky Quartet (CPO 777994-2).