Marcus Weeks is an author, a musician, and an editor. Books he has authored or coauthored include Music- A Crash Course, as well as DK's Children's Illustrated Encyclopedia and 1,000 Makers of the Millennium. He's written a number of works on music and is a curator of the Stanhope Collection of Historical Keyboards. Julian Rushtonis the emeritus professor of music at the University of Leeds, England. He has also taught at the University of East Anglia and the University of Cambridge, and has served as the president of the Royal Musical Association. His publications include Mozart- An Extraordinary Life, Mozart in the Master Musicians series, and Classical Music- A Concise History.