That's right Machine Head is looking for a replacement for their ex-bassist Adam Duce. They still haven't found one and now they are opening it up to the public. They are accepting submission until Friday, April 19th. Then they will go through and start to offer tryouts.
“Machine Head would like to thank all of the people who have submitted YouTube clips so far, we want you all to know that we’ve watched all of your videos, and while there may not have been an initial confirmation/reply that your video was received, we have been going through each of the many submissions one-by-one. We will continue taking submissions until next Friday, April 19th, at which point we will stop accepting submissions, select candidates and begin tryouts."
If you're interested set your YouTube videos to private with the allowed viewer set to MHBassAuditions@gmail.com. Also not that only do you need to be a badass bass player you will also need to be able to be a backup singer.