Singer Ke$ha performs during the iHeartRadio Music Festival at the MGM Grand Garden Arena in Las Vegas in September. Ethan Miller/Getty Images hide caption

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A Stradivarius violin is pictured in December 2009 at the restoration and research laboratory of the Musee de la Musique in Paris. Patrick Kovarik/AFP/Getty Images hide caption

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Paul McCartney, left, and John Lennon during a November 1963 Beatles show in London. The next month, the band had its first big hit in the U.S. and Beatlemania started to sweep America. AP hide caption

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Musician Lou Reed, for decades a rock icon, died Sunday at age 71. In 2006, he took a picture of an ad for his own photo exhibit in Naples. AFP/AFP/Getty Images hide caption

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Cookie Marenco records musicians on a small remote recording console live at the California Audio Show in August. She'll demonstrate the quality of DSD to the audience by playing back her recording. How close will it sound to the live performance? Very close, according to people present. Cindy Carpien hide caption

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Mom loved him. You love him. Prince performing in 1985. Ron Wolfson/Landov hide caption

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Members of the Mormon Tabernacle Choir raise their voices in unison — and perhaps unify their heart rates, too. George Frey/Getty Images hide caption

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