Upon getting back home, Mihailović got introduced to Zoran Milanović (bass guitar) and Slobodan "Koma" Kominac (vocals), both from Kragujevac, who asked him to join their upstart progressive rock band Gentry, an offer he accepted on condition that Stojanović become the band's drummer. During November 1971, the four met up in Kraljevo in order to officially form a band and, having been kicked out of Stojanović's family home by his grandmother who didn't appreciate the sight of four young men with long hair in her house, they went to a local restaurant and then to a nearby park where they wrote their first song, later named "Bluz u parku" ("Blues in the Park") in memory of the event.