Wolfgang Amadeus Mozart is the name of a child prodigy who was exploited as a child accomplished on the organ, harpsichord, and clavichord. He achieved fame on piano in 1778 at twenty-one. Mozart liked the tone, construction and durability of pianos made by Johann Andreas Stein but their high cost limited him to play a piano made by Vienna's Anton Walter. Mozart wrote many letters that described his own piano playing as a virtuoso and composer throughout Europe. He made a lot of money before he died in 1791 at thirty-six but spent more than he made and was buried in a pauper's grave. Mozart was the "greatest natural genius music has produced" according to research. He demonstrated the classic ideal with temperate and regulated dynamics and legato playing that "flowed like oil." Mozart played notes exactly as written by the composer and embellished them with expression and taste. He was skilled at sight-reading and improvising. Recent research consensus opinion is that Mozart was the first great pianist.