Mozart lived for just 35 years – years in which he knew great joy and great sorrow, and composed music that was to enrich the lives of millions. An infant prodigy, he wrote his first minuet at the age of six, his first opera at eleven. He died in December 1791 with his Requiem still unfinished; and his story has since become a legend. Popular myth represented him as a simple-minded youth with a miraculous musical gift: the truth is far more complicated and fascinating.

Also of interest
The Chronicle of Classical Music: An Intimate Diary of the Lives and
    Music of the Great Composers
Mozart: The Golden Years
The Chronicle of Opera