Ohannes Tunçboyacıyan (a.k.a. Onno Tunç; Armenian: Օհաննես Թունչբոյաջյան ; December 20, 1948 - January 14, 1996) was a leading Armenian-Turkish musician, working mainly as a composer and an arranger. Tunç also played bass guitar and occasionally double bass, contributing to the albums of several musicians. He was the elder brother of musician Arto Tunçboyacıyan. Using only the above description and what you know about the world, "Arto Tunçboyacıyan and Ohannes Tunçboyacıyan made a song together" is definitely correct, incorrect, or inconclusive? 