Rigor Mortis Sets In is the third solo album by John Entwistle, who was the bassist for The Who. Distributed by Track Records, the album was named John Entwistle's Rigor Mortis Sets In in the U.S. Co-produced by Entwistle and John Alcock, it consists of three Fifties rock and roll covers, a new version of the Entwistle song "My Wife" from The Who's album Who's Next, and new tracks (only six of the ten songs were new). Rigor Mortis Sets In set in motion John Entwistle assembling his own touring unit during the increasing periods of The Who's inactivity.