Nei Van Soria is a Brazilian singer-songwriter, lyricist, pianist, guitarist and record producer, famous for his work with pioneering Rio Grande do Sul rock bands TNT and Os Cascavelletes.

Os Cascavelletes were a Brazilian rock group from Porto Alegre, Rio Grande do Sul. One of the first rock bands from Rio Grande do Sul to acquire mainstream success nationwide alongside its "sister project" TNT, they were characterized by their irreverent style inspired by 1950s-era rockabilly culture and acts such as The Rolling Stones and The Beatles, and by their comical, profanity- and sex-laden lyrics. Some of their most famous compositions are "Sob um Céu de Blues", "Menstruada", "Estou Amando uma Mulher", "Eu Quis Comer Você" and the 1989 hit "Nêga Bombom".