John Dolmayan is a singer.
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 . System of a Down . The band currently consists of Serj Tankian ( lead vocals , keyboards ) , Daron Malakian ( vocals , guitar ) , Shavo Odadjian ( bass , backing vocals ) and John Dolmayan ( drums ) .