This TED Talk by sound expert Julian Treasure explores the power of the human voice as an instrument for effective communication and change. The talk addresses common barriers to being heard, highlighting seven harmful speaking habits to avoid, such as gossip, judging, and dogmatism. Treasure proposes four positive cornerstones—honesty, authenticity, integrity, and love—as foundations for impactful speech. He demonstrates key vocal techniques, including register, timbre, prosody, pace, pitch, and volume, and shares simple vocal warm-up exercises to enhance clarity and engagement. The presentation closes with a vision for a world where sound is consciously created and consumed, fostering understanding and connection.