theodp writes: "Practice, practice, practice. Then audition on YouTube. When then 10-year-old Hannah Tarley asked to get her ears pierced, her mom told the aspiring violinist she could if she performed at Carnegie Hall. Seven years later, using a computer placed atop several volumes of the Encyclopaedia Britannica, 17-year-old Hannah filmed herself in her bedroom playing Brahms' Symphony No. 4 to audition by video for the YouTube Symphony Orchestra. On April 15, Hannah will make her debut with others who made the cut at New York City's Carnegie Hall in a concert conducted by Michael Tilson Thomas, music director of the San Francisco Symphony."