Oh and by the way...
Take a listen to this (LesD sent it to me on fb). No doubt Carl you've probably heard this already, but others should enjoy.
Have a panadol ready tho.
It is the sound file of the 16 millisecond pulsars in the globular cluster 47 Tuc. One by one at first, until they all play together.
http://www.jb.man.ac.uk/~pulsar/Education/Sounds/47tuc1-8000.wav