Petrov's musical career began with his playing drums in Morbid, a Swedish extreme metal band which featured Mayhem vocalist Per Yngve "Dead" Ohlin in its original lineup.

Also in that year, he contributed vocals to fellow Swedish death metal band Comecon's debut album Megatrends in Brutality.

[citation needed] Metal Hammer described Petrov's voice as an "utterly unmistakable, glass gargling, slurring belch" as well as "throat shredding".

[16] He is especially well remembered among fellow musicians and fans in the death metal world for his friendly personality, enthusiastic performance, and propensity to smile.

[25] On social media, numerous metal bands took notice of Petrov's death and praised his work, among them Opeth,[26] Converge,[27] and Amon Amarth.