Dr. Sin is a hard rock / heavy metal formed in São Paulo, Brazil in the year 1991 by Andria Busic (bass/vocals), Ivan Busic (drums/backing vocals) and one of the most talented guitar players in Brazil, Eduardo Ardanuy.
The only change in the band's lineup was the addition of the American vocalist Michael Vescera (Loudness, Yngwie Malmsteen) in the Dr. Sin II times (2000). Vescera only remained in the band for a short time as he soon left the band to start his own solo project.