Prisons of the heart: French singer and former tennis player Yannick Noah (R) speaks with a man before a performance on stage at the Fresnes prison, south of Paris. The concert by Yannick Noah is part of a series of benefit concerts organised by the French non-profit "Les Prisons du Coeur" ("Prisons of the Heart"), an association which aims to fight against repeat offences and for the reintegration of prisoners after their release. Photos: AFP 

Flash Mob: Members of the Paris Academy of Music perform on the Palais-Royal square near the Louvre in Paris during a flash mob entitled "Voile blanc sur l'opera" (White Sheet on the Opera).

PSY's Hangover: This file photo shows Psy attending the Costume Institute Benefit at The Metropolitan Museum of Art. Psy, who set off a global sensation with "Gangnam Style," tried out a fresh sound as he released a hip-hop tale of drunken debauchery co-starring rap legend Snoop Dogg. Entitled "Hangover", the new song returns to the "Gangnam Style" theme of material excess . The video features Psy and the notoriously hard-partying Snoop Dogg on a night of intense boozing.