While downloading movies from unauthorized third-party sites can pose security risks, you can legally watch or download The Secret Life of Walter Mitty
A thousand times, yes.
One of the most iconic elements of this film is its , personally curated by Ben Stiller. The music used is a perfect blend of indie-folk and alternative music that enhances every scene, from the action in Greenland to the quiet moments in the Himalayas. Here is the complete song list from the soundtrack:
Amazon Prime Video and Google Play Movies allow you to purchase and download the file to your device permanently. Look for the "Exclusive" extended cut (though the theatrical is the director's preferred version).