Cave also took part in the "X-Files" compilation CD with some other artists, where he reads parts from the Bible combined with own texts, like "Time Jesum ...", he outed himself as a fan of the series some years ago, but since he does not watch much TV, it was one of the only things he watched. He collaborated on the 2003 single "Bring It On", with Chris Bailey , formerly of the Australian punk group, The Saints. Cave contributed vocals to the song "Sweet Rosyanne", on the 2006 album Catch That Train! from Dan Zanes & Friends, a children's music group.
These distinctions are often blurred. For instance, a bone removed from an animal carcass is a biofact, but a bone carved into a useful implement is an artifact. Similarly there can be debate over early stone objects that could be either crude artifacts or naturally occurring and happen to resemble early objects made by early humans or Homo sapiens . It can be difficult to distinguish the differences between actual man-made lithic artifacts and geofacts – naturally occurring lithics that resemble man-made tools. It is possible to authenticate artifacts by examining the general characteristics attributed to man-made tools and local characteristics of the site.