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
Imperfect Remixes Imperfect Remixes Imperfect Remixes is an EP by Armenian-American singer Serj Tankian, released on March 1, 2011, featuring edited remixes from his previous album, "Imperfect Harmonies", which was released in September 2010. This compilation features Tom Morello, providing the rock remix of "Goodbye – Gate 21". The album also has an extra B-side from the "Imperfect Harmonies" sessions, entitled "Goddamn Trigger". A music video for "Goodbye - Gate 21" was released on February 28, 2011. It features Serj Tankian, Tom Morello, the FCC, and an unidentified girl. Scenes of the band playing are interspersed with shots of the girl in