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Bob Dylan, Billy Joel and Willie Nelson are among the artists performing Paul McCartney songs in a massive tribute to the former Beatle due out in November.
Lamar was grateful to hear about Swift knowing the words to his lyrics. The rapper said her remarks show hip-hop shouldn't be categorized for one listener.
Stevie Wonder said the mayor of Ferguson, Missouri, isn't seeing the full picture a month after an unarmed black 18-year-old was killed by a white police officer.
What has been your song of the summer for 2014?