The fortepiano was the primary keyboard instrument for major composers of the Classical era , including Joseph Haydn , Wolfgang Amadeus Mozart , and early Ludwig van Beethoven .
: Between 1790 and 1870, the instrument underwent massive changes—including the introduction of iron frames and felt hammers—eventually becoming the modern piano we recognize today.
: Early pianos were extremely expensive and mostly owned by royalty and the aristocracy.
: Early models were lightweight with thin strings and small hammers, often weighing about one-sixth of a modern Steinway .
: Unlike the harpsichord , which plucks strings, the fortepiano uses leather-covered hammers to strike them. This allows the player to vary the volume based on the force of their touch.
: Typically had a range of about five octaves, compared to the modern standard of seven and a third octaves. Historical Significance