Watchtower

Watchtower is an American progressive metal band based in Austin, Texas, active from 1982 to 1993 and they have reunited occasionally since 1999. To date, the band has released two studio albums―Energetic Disassembly (1985) and Control and Resistance (1989)―as well as one compilation album, four digital singles, one EP and three demo cassettes. They are also notable for featuring vocalist Jason McMaster, who left Watchtower after the release of Energetic Disassembly to form Dangerous Toys, and was replaced by Alan Tecchio, who appeared on Control and Resistance and the band's 2016 EP Concepts of Math: Book One. After leaving the band once again in 2010, McMaster returned to Watchtower a second time in 2023.

Influenced by progressive rock and the new wave of British heavy metal (NWOBHM), Watchtower has been credited (along with Voivod and Coroner) for pioneering technical thrash metal. Their debut, Energetic Disassembly, has been cited as "the recording most responsible for the development of the progressive metal genre" and recognized as the first technical thrash metal album. Both Energetic Disassembly and Control and Resistance were strong influences on the emerging of technical death metal.