Keyboards of the 16th Century show their very own character not only because their ancient tuning. Thus they should be played with music of their own epoch to provide a true impression of their specific charm.
The Century of Bach and Mozart shows the extremely fast development of keyboard construction as well as the keyboard music, both of which caused the replacement of the violin by the piano as the main instrument.
Here are the complete Pianosonatas by Joseph Haydn, recorded on a PMI Walther Pianoforte sampled by Malcom Bilson (SF 2006) (The complete Pianosonatas by Joseph Hayden recorded on a Synthogy Ivory Steinway D are here)
The pianomusic of the 19th century is well known on modern instruments, while the sound of the instruments it was composed for differs significantly. Playing romantic pieces on historic pianos from the 19th century gives an impression how this music might have sound when it was played the first time.