James Taylor and Joni Mitchell at A&M

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Joni Mitchell's classic album Blue first tore through the emotional defenses of listeners 50 years ago today.

To commemorate the album's release, her label has dropped Blue 50, an EP that features five previously unreleased recordings from the album. Among the tracks featured are a demo version of "A Case of You" that features unreleased lyrics. There are also demos of "River" and "California" and another version of "Urge for Going," which was eventually released as the B-side track for "You Turn Me on, I'm a Radio."

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