Cassio Audi, from Sao Paulo, Brazil, began his music career as an instrumentalist. In 1985 alongside 4 other teenagers, Cassio formed a band known as Viper. Members of Viper alongside Cassio included Pit Passarell, Yvess Passarell, Felipe Machado and Andre Machado. Being influenced at the time by the England era of heavy metal and the rock band from the United Kingdom known as Iron Maiden, the band played along the same genre, heavy metal and alternative rock. The band took off and was able to achieve monumental airplay as well as landing numerous stage performances. Their talent commanded the crowds when they played from Brazil, all the way to the European and American continents. Cassio not only contributed his talent as a drummer of the band, he was also very involved in the composure of the songs.
Viper recorded their first demo known as The Killera Sword in 1985, and by 1987 they had recorded their first official album, known as Soldiers of Sunrise. Cassio was featured as the drummer in this album. This album was considered at that time to be one of the biggest and greatest hits in the Brazilian music industry. The album was very popular among international magazines, and sold over ten thousand copies.
In 1989, the band released their second album called Theatre of Fate. The album was released across Europe, Asia, and the United States. They had chart topping hits, even beating out groups such as Nirvana and Van Halen. With the albums mix of classical music and metal, this album became extremely noteworthy. While Cassio was a big part in getting the second album up and going, he was not actively involved in the recording, as he made the decision to leave the band, enroll in a University and pursue a different career path. While it may have been a short lived, overnight kind of career, Cassio contributed greatly to and had a huge impact in the Brazilian music industry.