Socrate Petnga (born 23 April 1979), better known as Mac Tyer (/ˈtaɪər/), is a French rapper of Cameroonian descent, from Aubervilliers, Île-de-France.
He was also member of Perestroika, a hip hop trio made up of Mac Tyer, Mac Kregor (real name Makenzy Guerrier), also from Aubervilliers, France but of Haitian descent and Dontcha.
The band was formed in 1999, and active initially for one year, with very rare appearances later on.
Tandem remained active until 2014, although its members also released solo albums of their own.
Tandem was signed at various times to Because Music, Première Classe and Hostile Records.