Legendary folk-rock duo Simon & Garfunkel released their fifth album, “Bridge over Troubled Water,” the same year they broke up. The album foreshadowed as much, featuring a number of songs where the two vocalists don’t sing together. The album shot to #1 on the Billboard charts and won two Grammys. Along similar lines, the title song sold millions of copies and won its own Grammy for Song of the Year.

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