I've always tried to learn anything, within reason, that I've had requests to do on the job. I save the lyrics and chord changes and listen to it enough that I can fake it if and when needed. This one started out that way, but over the years I've grown to like it better than I did at first.
There are a number of songs that I don't even try for various reasons. Maybe it's out of my range or beyond my playing and/or singing abilities, and maybe I just don't like it. All valid reasons to not do a song!
Thanks for listening guys.