Why did they change the music in "The Secret Life Of Walter Mitty?"

We watched this on FX last night, and the big scene when Walter decides to go to Greenland has been changed. Instead of "Wake Up" by Arcade Fire the song was by the Chain Smokers. I don't know the name.

This is a HUGE change to the movie. that scene & that song are iconic. I've never noticed movies change music like this. Does it happen? Why would they do this in Walter Mitty?

EDIT: I looked up the song title. it's

Step Out (Chainsmoker's Remix) by Jose Gonzalez.

Submitted November 21, 2016 at 02:20AM by thx316 http://ift.tt/2eUrYgY