Coldplay is a rock band .
In October 2011 , Coldplay released his fifth studio album , Mylo Xyloto , which topped the charts in over 34 countries and was the UK 's best-selling rock album of 2011 , but received mixed reviews , In May 2014 , he released his sixth album , Ghost Stories , which also received mixed reviews and topped the iTunes Store albums charts in over 100 countries .
Coldplay