1. American punk band from Los Angeles, California formed in 1977. 2. Australian rock band formed in 1977. X (Australia) 3. Metal band from Japan, founded in 1982, changed name to X JAPAN 4. Czech punk band formed in 2003. 5. Bulgarian metal band X (US) From the band’s earliest days, they were known for complex songs with a rockabilly edge. Unlike many punk bands from the same era, the band exhibited musical proficiency.