Who doesn't love the Doctor Who theme? If you're reading this then chances are you do love it - or at least one of its many variations.
The theme is instantly recognisable even to people who know virtually nothing of the show and is every bit as iconic as the TARDIS, the Daleks and of course the Doctor himself. When the series came back there really was no doubt as to what theme tune would be used.
Anyway here are a couple of videos which feature the theme tune. The first is from a Bill Bailey TV series where Mr Bailey does a rather good 'French jazz' version of the theme. The second is a video produced by the Revered Polarity Group (I think) which incorporates every version of the theme tune that was used on TV (plus a couple that weren't) and every title sequence used too.