; Shawn Crahan ( # 6 ) Active : 1995 â `` present Plays : custom percussion , backing vocals Performed in : all Slipknot albums Shawn Crahan was a member of the original band formed in 1995 and was originally the only drummer for a short time . ; Shawn Crahan ( # 6 ) Active : 1995 â `` present Instruments : custom percussion , backing vocals Release contributions : all Slipknot releases Shawn Crahan was a member of the original band formed in 1995 and was initially the only drummer for a short period of time .