Alt-J were part of Monday's South America Lollapalooza announcement, and took the opportunity to announce more spring tour dates. 

As previously reported: The event will move to Buenos Aires the next weekend, with Pharrell Williams replacing Kings of Leon among the headliners. Skrillex, Alt-J and Nicky Romero will also join the fray as Foster The People, The Kooks and NOFX drop out.

Finally the event will head to Sao Paolo for the fourth edition of Lollapalooza Brazil, featuring the same group of headliners and major acts as Argentina, plus the return of Foster The People and the addition of Marina and The Diamonds.

The Leeds boys are quickly becoming one of the most popular groups in the universe, but they haven't reached the stage where people actually recognize them.

"It's wonderful to maintain some personal anonymity," keyboardist Gus Unger-Hamilton told the Irish Mirror in September. "And we don't have to deal with paparazzi. We can ride buses in London without anyone batting an eyelid and then I'll be playing on the David Letterman Show the next week, so that's pretty cool."

They broke onto the scene with 2012's An Awesome Wave, and then followed that with 2014's This Is All Yours, which features the hit single "Left Hand Free."

"The first album seemed to transcend different musical tribes in terms of the people who listened to it," Unger-Hamilton said. "So we realised it was OK to make albums like that - we have a fanbase who trust us. So we thought, 'Let's do the same again'."

Monday, they released a slew of new dates in conjunction with the Lollapalooza announcement. Check 'em out:

03/12/15-03/15/15: Bogota, Colombia @ Estereo Picnic Festival Colombia
03/14-03/15: Santiago, Chile @ Lollapalooza Chile
03/21-03/22: Buenos Aires, Argentina @ Lollapalooza Argentina
03/28-03/29: Sao Paulo, Brazil @ Lollapalooza Brazil

03/30: New York, NY @ Madison Square Garden
04/01: Cleveland, OH @ State Theater at Playhouse Square
04/02: Pittsburgh, PA @ Benedum Center
04/03: Raleigh, NC @ Red Hat Amphitheatre
04/04: Atlanta, GA @ Chastain Park Amphitheatre
04/06: Nashville, TN @ Grand Ole Opry
04/08: Oklahoma City, OK @ Chevy Bricktown Events Center

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