Depending on which song titled "Where Are You Now" you are looking for, there are several official platforms where you can legally purchase or stream the track.
This track appeared as a deluxe bonus track on their album Babel : Where Are You Now MP3 Download
This EDM collaboration by Skrillex and Diplo can be found here: Mumford & Sons: Digital Music - Amazon.com Depending on which song titled "Where Are You
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