O'Hara gained prominence on the Yugoslav scene with their The Seekers-, The Hollies- and The Mamas & the Papas-influenced songs written by the band's organist and leader Frano Parać.

[2] Initially the band performed covers of international rock hits, but gradually moved towards their own material, written and arranged by Parać.

[1] In the autumn of 1966, they performed on the First Championship of Vocal and Instrumental Ensembles, held in Zagreb's Students' Cultural Center, entering the finals.

[4] In May 1967, the band performed on the Second Championship of Vocal and Instrumental Ensembles, Marcela Munger winning the Best Female Vocalist Award.

[4] The band appeared in the popular TV Belgrade show Koncert za ludi mladi svet (Concert for the Crazy Young World), performing covers of the songs "One Day" and "I Can't See Nobody".

[1] The new incarnation of the band performed acoustic music and featured, besides Munger and Boltižar, Dunja Dimić, Adonis Bozina and Ante Parat.

[1] In the years following her activity with O'Hare, Josipa Lisac would start her solo career, eventually becoming one of the most prominent acts of the Yugoslav popular music scene.