Has China found its own Gangnam Style? From Beijing parks to Shanghai skyscrapers, and from Guangzhou factories to karaoke rooms in Macao, people are singing Little Apple - a song apparently so catchy it has even won over the army and police.

Calling themselves the Chopstick Brothers, Xiao Yang and Wang Taili are neither brothers nor composers, but are responsible for a hit that has become a nationwide phenomenon.

Xiao Pingguo (Little Apple) was originally intended to promote their latest film when it was released in July, but it has proved to be an "earworm" - the kind of song that's so insistent it gets stuck in the brain.