Beginning Singing: Expand Your Range, Improve Your Tone, and Create a Voice You'll Love: Henny, John: 9798679263239: Amazon.com: Books
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Exercise: Smoothing out range & tone in a song—the trumpeted oow - Vocal Lessons: 2 Singing Songs Better Video Tutorial | LinkedIn Learning, formerly Lynda.com
11 Tips to Help the "Tone Deaf" Sing in Tune - Musical U