I don't really like bursting peoples bubbles, but sounds inducing lucid dreams is about as ridiculous as binaural beat drugs. No sounds are going to help you lucid dream. Truth is when you go to sleep your brain has exceptional reduced sensitivity to sounds so only loud ones will even be noticed, and at that point the sound would probably prevent you from falling asleep. Secondly, lucid dreaming is simply realizing you're dreaming. A sound making you realize you're dreaming is about as possible as a sound making you realize it's day time.