Bezzina was featured on the "Junior Popstars" competition, winning the competition and the title of "Junior Popstar". In 2003, Dario represented Malta in the Romanian "Ti Amo" festival, where he was selected from a pool of 44 participants to receive "The Special Prize of International Jury" award, singing the song "Credo." In 2004, Dario participated in the Junior Song for Europe contest with the self-written song "Eviva l-Muzika", where he placed 2nd. In 2005, Dario together with his sister Grecia, participated in the "L-Ghanja tal-Poplu Zaghzagh" with the song "Il-Habib ta' l-Iskola." The same song was sung by Dario and Grecia in the St. Lucia festival 2005. They placed first and also were the overall winners. In 2006 Dario participated in "L-Ghanja tal-Poplu" with the song "Bnedmin bhalna" which was penned by Gorg Saliba and composed by Sammy Galea. In 2007, Dario was one of the finalists in the Malta International TV Song Festival with the song 'Emmen Zaghzugh'. In 2008 Dario was one of the 11 finalists in The Malta Hit TV Song Festival with the song "Love Attack" and in September 2008 Dario was one of the 20 finalists in Konkors Kanzunetta Indipendenza with the song 'Hati'. In 2009 Dario along with his sister were semi finalists in the Malta Eurosong Festival, with the song 'Fjamma tas-sliem' penned and composed by Philip Vella. In September 2009 Dario and his sister Grecia were finalists in the festival Konkors Kanzunetta Indipendenza with the song 'Naghmlu Deal' penned by Godwin Sant and composed by Ray Aguis. Dario was also one of the semifinalists for the Eurosong 2010, with the song Grave Dancers written by Alexia Schembri and composed by Chan Vella. On Sunday 19 September 2010 Dario performed in Konkors Kanzunetta Indipendenza with the song 'Generazzjoni Tabu' penned by Mark Amaira and composed by Chan Vella. Dario Bezzina was one of the finalists of L-Ghanja tal-Poplu with the song 'Kamra bla Hitan' written and composed by himself. The festival was held on 4 December 2010. On 11 February 2011, during the Malta Eurovision semi final, Dario was one of the backing singers of the song 'You'll Never Know sung' by Rosman Pace. In September 2011 Dario participated in the festival Konkors Kanzunetta Indipendenza. Dario formed part of the group Silent Shout and participated with the song 'Ghad fadal Ghada' penned by Alexia Schembri and composed by Chan Vella. In February 2012, during the final of Malta Eurovision, Dario was one of the backing vocalists of the song 'Answer with your eyes' sung by Amber, where they placed third. Dario participated in L-Ghanja tal-Poplu 2012 as a composer, where he placed 2nd. The song, 'Tal-Komma Twila' was sung by Dario's sister Grecia Bezzina and written by Emil Calleja Bayliss. In September 2012, Dario and his sister Grecia, will be participating in Konkors Kanzunetta Indipendenza with the song 'Se Nibda Jien' penned by Rita Pace and composed by Dario.
