Two famous variation sets from the MISC@1 era , both for harpsichord , are PERSON@1 's The Harmonious Blacksmith set , and PERSON@2 's ORGANIZATION@1 , which together with PERSON@3 's late variations are widely considered to represent the pinnacle of the form .

PERSON@1 wrote a famous set of variations for harpsichord called Harmonious Blacksmith , and PERSON@2 wrote the ORGANIZATION@1 , which was a set of NUMBER@1 variations : a very long piece of music .
