I was originally going to keep this to just appearances Trent has made, but I thought I would open it up to any guest appearances that anyone who has been actively involved with the band has made over the years. It can be a regular track or even a remix that a member has done, but the only rule I have is that it can't be on an album that they produced in full, i.e. no Antichrist Superstar or NiggyTardust here.