Güvenç Dağüstün was born in 1978 in Ankara. He attended Hacettepe University State Conservatory and was a student to tenor Pekin Kırgız. When he passed the exam of Ankara State Opera, he had been the youngest member at this institution. 

He attended the masterclasses given by mezzo-soprano Ksgr. Prof. Margarita Lilova at International Varna Festival held at Varna in Bulgaria and one year later he won the exams of Vienna Music and Performing Arts becoming Prof. Lilova’s student this time. He started to work in Vienna right after he left Ankara State Opera.

His first leading part was “Belcore” at G. Donizetti’s "L’Elisir D’Amore” at İzmir State Opera. He was the first ever to sing baritone solos as well as the countertenor solo in a body at Innsbruck Austria in C. Orff’s “Carmina Burana” conducted by Georg Schmöhe and he was really appreciated.

He was among the soloists whom played at world premier of the Greek composer Perikles Liakakis’ opera "Der gestiefelte Kater” in Vienna.

He sang with Fazıl Say, Genco Erkal and the Eurovision winner Sertab Erener at the famous Turkish pianist and compser Fazıl Say’s “Nazım” oratorio first at Ephesus Ancient Theater and then at İstanbul Harbiye Open-air Theater and Atatürk Culture Center. He participated in various recitals with Fazıl Say and performed world premiers of Say’s songs. Recently he recorded Say’s “Nazım” on CD and DVD together with Fazıl Say, Genco Erkal and Zuhal Olcay with Bilkent Symphony Orchestra conducted by İbrahim Yazıcı.

His co-project with Sertab Erener “Turco – Latino Connection” concerts were put over and still continues to be staged.