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Compton, Calif., rapper Lamar was a standout of the festival in 2013. He is red hot at the moment. His second album To Pimp a Butterfly was released by surprise on Sunday and appears set to grab Billboard’s No. 1 spot next week.

Harper, whose organic mix of folk, blues and rock has been winning over Montreal audiences since the mid-1990s, played Osheaga’s inaugural edition in 2006. Get Up!, his collaboration with harmonica player Charlie Musselwhite, won the 2014 Grammy for best blues album.

Other notable names announced Wednesday include: Veteran New York rapper Nas; brooding indie-folkies The Decemberists, whose new album What a Terrible World, What a Beautiful World was released in January; L.A. power-pop favourites Weezer; British rock act alt-J, whose second album This is All Yours came out in the fall; British electro band The Hot Chip, which will release its sixth album, Why Make Sense on May 18; American indie/electro singer-songwriter St. Vincent, who performed at the Montreal Jazz Festival last summer in support of her self-titled fourth solo album (she also collaborated with David Byrne on the 2012 album Love This Giant); synth-pop band Future Islands, whose fourth album, Singles, was released last year; and Australian electronica artist Chet Faker, whose debut Built on Glass combines elements of trip hop and soul.