Inside the TARDIS, the Doctor lays on the floor composing music with the aid of a quill. After a few moments he leaps to his feet and places the complicated manuscript on a reading stand, when the TARDIS console begins to sound and alarm. He investigates the problem and suddenly a Graske appears inside the ship.
The creature, which claims it must speak to the Doctor, first enquires as to the strangely melodic echoing sound that is filling the console room. The Doctor claims it is the gravity patterns from the planets, sun and galaxies moving around outside being filtered through the TARDIS harmonic filters. This is the sound of the universe…
The Graske then explains that he came to warn the Doctor of a space portal, which then opens up a few feet away from them. The Doctor looks through the rip in time and space and finds that it has opened up on Earth, inside the Albert Hall during the yearly Proms. He speaks to the audience excitedly and an idea strikes him. He picks up his manuscript and throws it into the portal for the orchestra to play. Conducting with his Sonic Screwdriver he premieres his piece, called Ode to the Universe.
However, trouble is afoot. The Graske has also fled through the portal and emerges in the Albert Hall, causing havoc with the Doctor’s water pistol. He did not come to warn the Doctor, he came to find a shortcut to Earth. Eventually the Doctor manages to pull the creature back to the ship them banishes it to the other side of the galaxy.
As he prepares to close the portal, the Doctor speaks with the audience again, telling them that music is more than orchestras and band; it encompasses everyone and everything. He tells them to close their eyes and listen to the sounds around them – the music of the spheres…