Cláudio Márcio de Souza Santos, better known by his stage name Speedfreaks or simply Speed, was a Brazilian rapper, composer, musician, and member of the Underground Hip Hop duo Black Alien & Speed. He was considered to be a pioneer in the Brazilian Underground Hip Hop genre. Like most rappers of the genre, his lyrics talked about the reality of the Brazilian streets, dealing with crime, poverty, prejudice in general, drugs and money.
According to Isto É magazine, Speedfreaks created "one of the best rap records of recent times". Unfortunately, he died, murdered on March 26, 2010.