This classic riff by Pink Floyd is off Dark Side Of The Moon - one of the greatest albums of all time. I know no one listens to albums all the way through anymore but try it with this one! You won't regret it.
This video lesson breaks down the odd time signature and takes you through a few techniques and tips on open strings. The TAB/notation can be downloaded below. I've included the other basslines from this little series I did. They can be found here (scroll through till you find them or use the search bar above).