premise: John Dolmayan is a person.
hypothesis: John Hovig Dolmayan ( Ջոն Դոլմայան , born July 15 , 1973 ) is a Lebanese-born Armenian -- American songwriter and drummer . He is best known as the drummer of System of a Down . Dolmayan is also the drummer for the band Indicator and former drummer for Scars on Broadway . Loudwire listed him as one of the Top 50 Hard Rock + Metal Drummers Of All Time , with Dolmayan being ranked at # 22 . System of a Down is an American rock band formed by musicians of Armenian origin : vocalist Serj Tankian , guitarist Daron Malakian , bassist Shavo Odadjian , and drummer John Dolmayan in the mid-1990s .