Well Andy,

I've read the links. That was cool. Thank you. I never thought about it before but this riddle, in hindsight, does seem to be rather typical of a Dr. Who plot.

And again, Happy Birthday. Oh, and by the way, I do remember quite a bit about 1975. In fact, I subscribe to the opinion that rock and roll music reached its peak in the mid to late 1970z. But, I rather suspect that everyone thinks rock and roll music reached its peak when they were teenagers.