I love slavery

Not so long ago approximately ten million Africans were captured and sold (sometimes by fellow Africans) to European traders (link). These people were re-sold and brutally oppressed in a foreign land for money and privelege. The terrible life these people lived was beyond comprehension and can only be viewed as a stain on humanity. Without this shocking period in history, however, we would almost certainly not have Jazz, Blues and therefore Rock and Roll and therefore no Beatles, no Genesis etc etc etc.

Of course I am being flippant. In no way do I condone the slave trade, however by the benefit of hindsight we can say that some good did come out of this event.
It's impossible to say what would have happened to music had slavery never happened. It may well have picked up African influences anyway, but in any event I doubt whether we would have the richness and diversity in music that we have now.

Of course we wouldn't have had James Blunt. Hmmmm ....