For good reason: It’s a 12-minute epic that features wondrous Lamar verses about Nelson Mandela, devotion, spiritual enlightenment and power. More important, after a postscript Lamar spoken-word piece, the artist conducts a time-travel “interview” with the late Tupac Shakur that gradually rises into a free-jazz jam seemingly beamed from 1967.

It’s a fiery few minutes in which the two “converse” about, among other things, fame, the fattening of the upper class and the lifecycle of the black man’s power, something that Shakur says diminishes at an early age. “Once you turn 30 it’s like they take the heart and soul out of a man, out of a black man in this country. And you don’t wanna fight no more. Enjoy dope music

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