The public has been invited to take part in what has been described as the first virtual orchestra.
Sitting on the cubes activates the note
Plastic cubes, attached to a light and a speaker, have been laid out on a full size orchestra stage outside the Royal Festival Hall on London's South Bank.
Sitting on a cube activates a musical note and as more people sit down, more of the score is revealed.
Owners of Bluetooth phones will also be able to receive a free ring tone of the Philharmonia Orchestra playing.
People can also record their own sound and then send it to the orchestra using this technology.
Exploiting new media
These sounds will then be added to the online sample library and some will be used as part of a new piece of music being composed for the culmination of the project.
Jude Kelly, Artistic Director of South Bank Centre, said: "This is exactly the way we are looking at developing our site by fusing the community with the artistic world of ideas and technology in our many versatile spaces."
Alistair Mackie, chairman of the Philharmonia Orchestra, said: "Central to the Philharmonia Orchestra's vision is exploiting new media to take music out to the widest possible audience, breaking down the barriers which have stood in the way of their access and enjoyment."
The event runs from Friday until 2 October, and each Saturday there will be live events with live Philharmonia musicians and sound recording equipment.