Ozzy Osbourne performs at the 25th-anniversary Rock and Roll Hall of Fame Concert at Madison Square Garden. Stephen Lovekin/Getty Images Entertainment hide caption

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Jeff Ellis. Brian Blauser hide caption

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April Smith and the Great Picture Show's "Colors" is at least as much a ballad of heartfelt yearning as it is a stomp-and-swagger jam. Eric Ryan Anderson hide caption

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Scrapomatic. Brian Blauser hide caption

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Drummer. courtesy of the artist hide caption

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Members of Dr. Dog. Brian Blauser hide caption

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Mumford and Sons' rich harmonies and infectious melodies bring to mind Crosby, Stills and Nash. courtesy of the artist hide caption

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Beth Nielsen Chapman. Brian Blauser hide caption

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As a solo singer, Tillman releases a hushed and respectful hymn for a modern age. courtesy of the artist hide caption

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Midlake Bil Zelman hide caption

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