On Thursday (Dec. 8), Coldplay has announced a 21-date 2012 North American tour, in support of its just-released fifth album, "Mylo Xyloto." The run kicks off on April 17, 2012 in Edmonton, Alb. and will conclude on Aug. 11 in St. Paul, Minn. Tickets for most shows go on sale on Dec. 17. "Mylo Xyloto" became Coldplay's third No. 1 album upon its Oct. 25, topping the Billboard 200 with 447,000 copies sold in its first week, according to Nielsen SoundScan. Although the album was released after the 2012 Grammys eligibility period, its first two singles, "Every Teardrop is a Waterfall" and "Paradise," were nominated for Best Rock Peformance and Best Pop Duo/Group Performance, respectively. While "Paradise" sits at No. 4 on the current Rock Songs chart, Coldplay's next single, "Charlie Brown," will be serviced to radio later this month.