On April 9, 2010, Watchtower released a preliminary mix of "The Size of Matter" from their forthcoming album "Mathematics" as a digital-only single. It marked the band's first new music since "Control and Resistance" in 1989, featuring Jarzombek, Keyser, and Colaluca, with Alan Tecchio returning on vocals and replacing original frontman Jason McMaster for the second time in the band's history. In May 2010, Tecchio left Watchtower once again. After the announcement of Tecchio's departure. Watchtower's last public appearance was at the German Keep It True festival in 2010.