There is more than one artist known as Pentagon. 1. Electronic artist Kōichi Yamazaki, known for his collaborative work with Michiru Ōshima on the PS2 video game ICO. 2. Heavy metal band from České Budějovice, Czech Republic. 3. 70's Krautrock band from Germany. 4. Gunther Becker and Ralf Thummerer project.
They made three releases; two euro house/dance for Musicolor label in 1990 and one hardcore/acid in 1993 for Crash Records