The music career of Cassio Audi expanded from the 1980s to 1990s. Originating from Brazil, Cassio performed songs such as Wings of the evil, Knights of Destruction, The Whisper killers, and Law of the Sword. This is a quick synopsis of songs found on his hit albums Krillera Sword, produced in 1985, and Soldiers of Sunrise, produced in 1987. During this time Cassio played alongside fellow band members Pit Passarell, Andre Machado, Felipe Machado, and Yves Passarell. Allocating a myriad of time towards his music, Cassio’s career started to peak after releasing the album Soldiers of Sunrise.
To many, this album pushed Viper over the milestone, landing them in the hearts of many fans. Many were surprised that a band consisting of Brazilian entertainers, could become so popular producing music in the English language. This was due to English being the second language of Brazil. Cassio would continue to showcase his musical talent with his album Theater of Fate, released in 1989. During his time performing alongside the members of the Viper group, Cassio Audi dedicated his talents as a drummer and composer. The band emanated their greatness during a musical concert known as the SP Project.
After the performance, the Vipers attained a solid spot in the eyes of hard rock fans, motivating the group to produce a demo album in an attempt to reach more fans. In the year of 1985 Viper finally released their demo, Killera Swords. Many songs produced by the group where in fact inspired by the British rock group, Iron Maidens. This inspiration would exude from many of the musical pieces such as, Soldiers of Sunrise, and Law of swords. These hit songs would not only resonate with the fans of Brazil, they would soon become a favorite piece of musical history for fans throughout the United States as well.