As always, turn away, place a finger over one ear lobe, then quietly play a 2 hole draw to check you are in tune before joining in. The D harmonica in your pocket is perfect for a 2nd position blues in A. A good acoustic blues player in a park next to the beach. Impromptu performance opportunities will arise. Remove any lint before playing, by blowing hard into the holes, then into the back on both sides. A late bus is also less vexing with a harmonica at hand. If you don't carry one you are missing practice opportunities. Keys, coins, a mobile phone perhaps, some fluff.
