Osheaga 2015 lineup partially revealed by Evenko

Kendrick Lamar, Black Keys andFlorence and the Machine are at the top of theOsheaga2015 lineup.

Montreal concert promoter Evenkounveiled a partial lineup via a smartphone game app.

Music fans looking to discover bands playing at the popular annual festival had to download the app and follow the clues.

The complete lineup will be revealed March 24 at 12 p.m. ET, the same time and date festival tickets go on sale. The festival will hold its 10th edition from July 31 to Aug. 2 at Montreal's Parc Jean-Drapeau.

Major musical acts so far announced:

• Kendrick Lamar.
• Florence and the Machine.
• The Avett Brothers.
• The Black Keys.
• St. Vincent.
• Alt-J.
• The Decemberists.
• Hot Chip.
• Weezer.
• Nas.

The lineup also includes the Kills,Caribou, Future Islands, the War on Drugs, Ben Harper, Of Monsters and Men, Edward Sharpe and the Magnetic Zeros, Charli XCX, Gary Clark Jr., Action Bronson, Brand New, Patrick Watson, Twin Shadow, First Aid Kit, Toro y Moi, Philip Selway, Viet Cong, Alvvays, MS MR, San Fermin, Young Fathers, Young the Giant, Tyler the Creator,Run the Jewels, Interpol, Caribou/Daphni, Schoolboy Q, Father John Misty, Milky Chance, Kygo, Marina and the Diamonds and Stromae.