That’s a quiet, clever idea—wind chimes do sing in patterns, but their tones drift with breeze and weather. If you’re chasing a secret key, you might find the same unpredictability that makes the music feel alive could also make the exchange fragile. It’s beautiful to think of nature’s own whisper as a code, but I’m not sure it’s steady enough for covert comms. Perhaps keep the chimes for calm moments, and let the wind itself be your silent companion.