Four years on from Beijing 2008, over a hundred Chinese stars have teamed-up to congratulate 2012 London Olympic Games in song.

Many top names have been lured to the project by celebrated actor Jackie Chan - the driving force behind the project. The song Best Wishes from Beijing is a good-luck message to London - from the city that hosted the last games in 2008. Among many celebrities is world-famous pianist Lang Lang. As well as playing the main tune on his piano, he's also adding to the chorus with his voice.

Lang said, "It's our greetings to London, and at the same time to welcome everyone from the world to come to Beijing in the future. So it's a very friendly, very open, kind of optimistic feelings."

Upcoming Chinese composer Chang Shilei wrote the music for the song. He said he tried to find a musical parallel with the 2008 theme song, Beijing Welcomes You.

Chang said, "This is the sister song of Beijing Welcomes You. So in the process of composing, I first wrote two melodies that I could mix to make it relate to Beijing Welcomes You. It's just like that. When I was writing the song I felt very happy. I wrote it in just 20 minutes."

In charge of the music video is Wang Caitao, another young artist and film director. He has the difficult task of fitting a hundred stars and some of China's most iconic venues into a five minute video-clip .

Wang said, "Tiananmen Square, Jinshui Bridge, the Great Wall, the Temple of Heaven are places that are among the hardest places to film in the world. They won't let you film. This, for me, is the biggest challenge of all."

Lang has already been filming a special Gala for China Central Television (CCTV) that will present Best Wishes from Beijing. It was filmed near the National Stadium, often known as the Bird's Nest, and Water Cube - two landmarks of the 2008 summer olympics. The final video will be sent to London. Lang is then due to take part in the London torch relay on July 22. And he's looking forward to attending the opening ceremony this time as a guest in the audience.

"Beijing Olympics was a milestone for China and I'm sure it will be a milestone for UK as well," Lang said.

The special CCTV gala will be broadcast on July 27, coinciding with the opening of the London Olympic Games.