This limitation on the set meantone notes and their sharps and flats that can be tuned on a keyboard at any one time, was the main reason that Baroque period keyboard and orchestral harp performers were obliged to retune their instruments in mid-performance breaks, in order to make available all the accidentals called for by the next piece of music. Some music that modulates too far between keys cannot be played on a single keyboard or single harp, no matter how it is tuned: In the example tuning above, music that modulates from C major into both A major (which needs G for the seventh note) and C minor (which needs A for its sixth note) is not possible, since each of the two meantone notes, G and A, both require the same string in each octave on the instrument to be tuned to their different pitches.
this limitation on the set meantone notes and their sharps and flats that can be tuned on a keyboard at any one time was the main reason that baroque period keyboard and orchestral harp performers were obliged to retune their instruments in mid-performance breaks in order to make available all the accidentals called for by the next piece of music some music that modulates too far between keys cannot be played on a single keyboard or single harp no matter how it is tuned in the example tuning above music that modulates from c major into both a major (which needs g for the seventh note) and c minor (which needs a for its sixth note) is not possible since each of the two meantone notes g and a both require the same string in each octave on the instrument to be tuned to their different pitches