In yet another article/interview promoting today's release of R40 Live, Alex Lifeson and Geddy Lee sat down with Entertainment Weekly to share the stories behind some of Rush's many iconic songs including Headlong Flight, Roll the Bones, Tom Sawyer and Losing It, which the band played live for the first time ever on R40 Live:

... AL: I suggested [performing it in 2015] and the guys embraced it. We'd never played it live and it has such a particular character to it. We wanted to keep the show pretty up and this was a lower, quieter moment.
GL: Since we had been on tour with a string ensemble last year, the idea of bringing an extra person on stage wasn't foreign anymore.
AL: [Fans] loved it. The great thing about playing it live was you don't know what was going to happen. You hope you get through without a horrible trainwreck. It's exciting to break away from the regimented, rehearsed stuff we normally do. ...

You can read the entire article online at this location (thanks John at Cygnus-X1.net.