You could get it on a recording and play it on watch instead of singing.
Nope. Unlike the Air Force, ‘standing watch’ in the Coast Guard actually requires that you stand up and watch for things.
However, there’s no rule saying you can’t sing, although it’s frowned upon by the current command. So not while the new XO is on the bridge.
Said XO has a stick up his a$$. He used to be at the Academy, so, you know, getting any enjoyment out of your job is out.