There´s more than one band called Plexus. This one is a heavy metal group founded on 2000 in Salvador, Bahia, Brazil.
With Marcelo Martins on guitar/vocals, Ricardo Sobrinho on the bass and Iassa Lima on drums, they released till now two albums (plexus, from 2003 and lifecycles from 2006).
You can download the full Lifecycles albums at their site. http://www.plexusband.com.br/