Sound Sultan was born Olanrewaju Fasasi. His career in show business started professionally in the 90's.
By 1999 he had won numerous local talent hunt shows, then he released his first single Jagbajantis in 2000 which went on to be an instant hit and a classic song in Nigeria.

SoundSultan teamed up with his brother Baba Dee to start "Naija Ninjas" which is a franchise that parents a record label, production outfit and a clothing line. He is reputed for having several style and genre of music. After starting off a rapper, he has switched from R&B, Afrobeats, Soul and Fuji. He classifies his style as Jagbanjantis.

Under Naija Ninjas he released "Back From The Future"(2010) and signed a couple of artists such as Karma Da Rapper, Young GreyC, Shawn and Blacka.