21 (Adele album) and vocal problems led to numerous alterations to the tour itinerary. The cancellation of the North American leg of the tour was due to a vocal haemorrhage on her vocal cords. The singer underwent corrective vocal surgery in November 2011 and cancelled all public appearances until February 2012. Adele performed "Rolling in the Deep" at the 2011 ECHO Awards, 2012 Grammy Awards and 2012 BRIT Awards ceremonies. "21" yielded five singles in total, including four worldwide releases. The lead single "Rolling in the Deep" was released in November 2010, and peaked the charts in the Netherlands, Germany, Belgium, Italy, and
21 (Adele album) achieved separate consecutive number-one spells during its 2011 chart run on the UK Albums Chart, claiming the top spot for 11 straight weeks between February and April 2011, then for five consecutive weeks between April and June, and then for another two weeks in July 2011. It amassed 23 weeks at number one to date. Midway through 2012, "21" was the best-selling album of the year despite being released in early 2011. In December 2012, "21" overtook Oasis' "(What's the Story) Morning Glory?" to become the fourth best-selling album of all time in the UK. By December 2012, "21" had