Throughout the band's history, Marilyn Manson has only had one consistent member, being Marilyn Manson himself. This is a timeline of all of the band members since their formation in 1989. Most, if not all, members of the band have contributed performances (either live or in-studio) on instruments other than their primary ones. For instance, Gacy has played theremin and calliope, Manson has played pan flute, harpsichordKeyboards, and guitar, and Berkowitz has been credited with bass guitar and drum machines. Keyboardists Madonna Wayne Gacy and Chris Vrenna have also performed additional percussion on-stage, and current touring keyboardist Spencer Rollins plays additional guitar live. Further details on these contributions can be found in the individual members' articles, and in the articles on the band's albums.