This page is not finished yet, so there are just a few links, for now.
Here are my favourite and most useful links:
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Music
Queenzone.com one of the many sites dedicated to the 4 geniuses
Webpage devoted to John Lennon
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MIDI Files
Classic Music (quite excellent)
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Astronomy
To know the position of the sun and the moon at any date and time
Java Applets to compute and see the sun path in the sky (free and working properly)