Book excerpt: Once musicians such as Mozart were little more than court servants; now they are multimillionaire superstars wielding more power than politicians. How did this extraordinary change come about? Tim Blanning's brilliantly enjoyable book examines how everything from the cult of the romantic to technology and travel all fed the inexorable rise of music in the West, making it the most dominant and ubiquitous of the art forms. Encompassing balladeers, the great composers, jazz legends and rock gods, this is an enthralling story of power, patronage, creativity and genius.