Morally, the world is both better and worse than it was. We are worse off than in the middle ages, or the 17th and 18th centuries, in that we have the atomic menace.

In contrast, traditional classical music starts from an abstract musical schema. This is then notated and only expressed in concrete sound as a last stage, when it is performed.

First, it doesn't surprise me that traditional music has experienced a kind of exhaustion in the 20th century - not forgetting that many musicians started to look outside the traditional structures of tonality.

Take a sound from whatever source, a note on a violin, a scream, a moan, a creaking door, and there is always this symmetry between the sound basis, which is complex and has numerous characteristics which emerge through a process of comparison within our perception.

There is a science to managing high tech businesses, and it needs to be respected. One of them is that in technology businesses, leadership is temporary. It's constantly recycling. So the asset has limited lifetime.

At its best, management theory is part of the democratic promise of America. It aims to replace the despotism of the old bosses with the rule of scientific law. It offers economic power to all who have the talent and energy to attain it.

Who needs to graduate from Central Saint Martins in London or New York's Fashion Institute of Technology when a homemade outfit can go viral on YouTube with millions of hits?

As digital culture becomes more tied to the success of the platforms where it flourishes, there is always a risk of it disappearing forever.