To broaden this discussion somewhat - there are lots of multi-talented professional musicians doing other things than music. And many people in other professions are very good musicians (every four years in Fort Worth is the Cliburn International Amateur Piano Competition.

I suspect for Currie, while he's out there looking around he's using the time to think about lots of things, including music. Back in the day when I was doing a lot of backpacking and mountain climbing, I (a writer) composed some of the best essays in my head as I walked. Interesting how the brain processes things, how one activity can provides different avenues into other interests.