FILE - In this Oct. 1, 2016 file photo, Kendrick Lamar performs on the second day of the Austin City Limits Music Festival in Austin, Texas. Lamar called out rappers by name in his infamous "Control" verse released in 2013, but the internet is playing the guessing game about his target in a new song. Lamar released "The Heart Part 4" on Friday, March 24, 2017, and caused a frenzy on social media as fans and listeners tried to figure out whom the rap prince was referring to in the buzzed track. (Photo by Jack Plunkett/Invision/AP)
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