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You have to buy it on the internet or at a music store.
It can be found on the album Doctor Who Music from Series 3
you cant
I've been looking for the actual sheet music but I go on youtube and look up 'Doctor Who Theme - Synthesia'
See related links for original and new theme music.
Ron Grainer and Delia Derbyshire.
It's on the album "Doctor Who: Variations on a Theme" which was released in the late 1980s. It's been issued a few times on CD and was used as the theme for a series of VHS retrospectives put out by BBC Video (The Hartnell Years, etc). Get thee to eBay (just make sure to avoid the square CD edition - that thing never worked properly).
The sheet music can be doenloaded at http://www.mondas.org/soundmusic/soundmusic.htm
Either you get the notes (the music score), or you play it from memory.
The Doctor Who theme music has no name, it's just known as 'The Doctor Who theme'. It's remained pretty much unchanged since it was first introduced in 1963, although the middle part played in a major key was introduced in 1981 when Peter Davison took over as the Fifth Doctor.
According to Wikipedia, seven. Though most of them are just different versions of the same song.
It's called the Dr Who Theme and has beeen continually tweaked and developed since 1963 to bring in different musical instruments.