Roots of Rob Bourdon

Earth, Wind & Fire is an American band formed in Chicago, Illinois, in 1969. Their music spans multiple genres, including jazz, R&B, soul, funk, disco, pop, Latin and Afro-pop. They are among the best-selling bands ever, with sales of over 90 million records worldwide.

System of a Down is an Armenian-American heavy metal band formed in Glendale, California, in 1994. Since 1997, the band has consisted of founding members Serj Tankian, Daron Malakian, and Shavo Odadjian (bass); along with John Dolmayan (drums), who replaced original drummer Andy Khachaturian.