Sin are a Brazilian hard rock band formed in São Paulo in 1991 by Eduardo Ardanuy and brothers Andria and Ivan Busic.

After a few shows, the trio decided it was time to invest in their career, and formed Dr Sin.

In February and March they performed shows in New York in the USA, and in May they opened for Ian Gillan from Deep Purple in Sao Paulo.

Unlike their debut album, Brutal was self-produced, and displayed a heavier and more cohesive sound than their previous work.

Andria and Ivan Busic participated in a fundraising campaign for the CACCC, which helps children with cancer.

Dr Sin performed at the 1997 Skol Rock festival alongside Bruce Dickinson, Scorpions and Dio.

The album was received warmly by fans and critics[citation needed], especially Vescera's contributions.

Dr Sin II featured guest appearances from guitarist Sérgio Buss, Jason Himmelberger and Joey Gross Brown on keyboards and Roland Grapow.

In mid-2001, vocalist Vescera decided to leave the band, citing the long travel between the USA where he lived and Brazil.

Recorded in May 2002 at the SESC Ipiranga in São Paulo, it features guest appearances by André Matos in the song “Fire”, Marco Sergio on charango, Marco Cesar on percussion and keyboardists Joey Gross Brown and Marcelo Souss.

On July 21, a new song called "May the Force Be with You" was made available for download on their website, named after the classic film Star Wars.

In the same month, the band contributed to the soundtrack of the Brazilian film Assault to the Central Bank, directed by Marcos Paulo.

In August 2015, the band announced on their Facebook page that they would end their activities, thanking all the fans for their support during their 23 years of work.

Andria and Ivan formed a new band called Busic, featuring Portuguese lyrics and a sound more rooted in 70s rock.

Their first new album with Melo, Back Home Again, was released on digital platforms on October 19, 2018, and featured the single "Lost in Space".