Born in Gorizia, Italy, to Slovenian parents, Mozetich moved to Hamilton, Ontario in 1952, where his father found work as a machinist.
With the help of the Canada Council, he then continued his musical studies in composition privately in Rome, Siena and London with Luciano Berio, Franco Donatoni, and David Bedford.
He co-founded Arraymusic with John Fodi, Clifford Ford, Gary Hayes, Michael Parker, Alex Pauk and Robert Bauer, and served as artistic director.
[3] Mozetich developed a style of post-modern romantic music,[6] which consists of a blend of the traditional, the popular, and the modern.
Since the 1990s, Mozetich's works have continued to demonstrate a taste for lyricism, romantic harmonies, and moto perpetuo rhythms.
His works that explore the spiritual have introspective and meditative qualities; these can be heard in his earlier pieces such as El Dorado.
[9] An example of this is his composition El Dorado (1981), a mixture of minimalistic Gatling gun rhythms, lyrical melodies, sensuous scoring, and late-romantic textbook harmonies.
[5] Blending the sound of the accordion and strings with consistent high-energy pulsation and repetitions, this piece is written in a ¾ waltz tempo, which is typical of the music for the dance-hall or cabaret.
[3] From 1976 to 1981, his style shifted toward a lyrical minimalism[11] with strong harmonic definition, as demonstrated in works like Procession for chamber ensemble (1981) and El Dorado for harp and strings (1981).