Having worked as an ambiental music composer, in 1989, Aćin founded the gothic rock band BAAL, as its keyboardist and lead vocalist, with bass guitarist Srđa Popović, guitarist Vojkan Petković, and drummer Vlada Marinković.
Its founding members, Slobodan Đinović and Srđa Popović, were leaders of the Serbian youth resistance movement Otpor! (Serbian for Resistance!), which played an instrumental role in deposing Slobodan Milošević in 2000.
Mića Popović | Ana Popovic | Srđa Popović | Popovic | Jovan Sterija Popović | Davorin Popović | Vladimir Popović (diplomat) | Vladimir Popović | Vladica Popović | Popović | Koča Popović | Dragan Popović | Dragan "Don" Popović | Bogdan Popović |