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Was vaccinating vulnerable people first a good choice? Hindsight allows us to assess this question.

A game you're almost certain to lose...

What are the challenges of communicating from the frontiers of mathematical research, and why should we be doing it?

Celebrate Pi Day with the stars of our podcast,

*Maths on the move*!Maths meets politics as early career mathematicians present their work at the Houses of Parliament.

For a person with normal (not absolute pitch) hearing ( and for the purpose of the Copyright Law), the key of the melody is immaterial. This immediately reduces your estimate by a factor of 12. Furthermore, most (>99% ?) series of random pitch jumps would not be considered a melody but a cacophony. I suspect the actually number of possible "ear-pleasing" melodies is within reach of one generation of 5 bln. people. Soon , we will be hearing mostly recycled music. And it's OK, since copyrights do not last forever.