Robert Plant and Pharrell Williams will be among the Lollapalooza headliners in March in Argentina, Brazil and Chile, among the first dates on the global festival calendar. The South American editions of Lollapalooza, which started as a traveling alternative rock festival before finding a permanent home in Chicago and expanding overseas, will take place in Santiago on March 14-15, in Buenos Aires on March 21-22 and in Sao Paulo on March 28-29. The headliners - the same for all three venues - include Williams, who is known for his global smash hit ‘Happy,’ and Plant, the legendary vocalist of Led Zeppelin who this year released his first album of new material in a decade. Other headliners include the Smashing Pumpkins, the 1990s alternative scene heroes who are soon releasing a new album, along with White Stripes rocker Jack White and the DJ Calvin Harris. The Lollapalooza South American lineups, which were announced Monday by organizers, offer an idea of some of the musicians who are likely to be on the global festival circuit throughout 2015.