WeightedRandom

A random choice, where different percentile ranges have different probabilities of chance

The ability to to weighted randomness is essential to the NIPL project - the intent being to choose a song at random, but to weight the choice in favour of songs that are known (or estimated by the system) to be preferable choice, and weight away from undesirable choices.

So how do we do it?

(nemo feels like writing this tomorrow, yes he does)