Mixtapes

South Korean singer Park Jae-Sang, also known as Psy, performs during his free concert in Seoul on October 4, 2012. The municipal government closed off part of the city centre and extended subway operations for the estimated 80,000 fans who packed the open venue outside Seoul City Hall and spilled out into the surrounding streets. The video to “Gangnam Style”, featuring Psy’s much-imitated horse-riding dance, went viral after its July release on YouTube, where it has now notched up more than 350 million views. AFP PHOTO / KIM JAE-HWANKIM JAE-HWAN/AFP/GettyImages

‘Do Not Disturb’ sign on door handle