Based on the classic music and sound design, Delta. O. Yanni have focused on the fusion of Eastern and Western music, acoustic and electronic sound. As the composer/arranger in-residence of ‘Hearts of Vision Chamber Orchestra’ since 2007, Delta. O. Yanni composed and arranged all program of Carnegie Hall in 2011 and 2015, and all program of 2018 London International Music Festival. They arranged the concert for the Conference of States Parties(COSP) to the Convention on the Rights of Persons with Disabilities(CRDP) held at UN Headquarters in 2014 and 2016. Now they compose diverse genre of music such as the BGM and the sound of the game ‘Fortress Battle Royal’ and the album of Gayageum ensemble ’Chung’. Delta. O. Yanni make steady efforts to become humanistic composer who keep their eyes on human, to link Eastern&Western music and classic&modern sound for their coexistence and to make the balance of the cold world of 0 and 1 and the warm breath of the performer.