 Those trained in fixed-do will argue that their act is the analogue of reading aloud in a language.Just as one reads this very sentence without parsing it grammatically, so too fixed-do is the direct sounding of the music.Where the movable-do system requires constant real-time analysis of the tonality and modulations in the score, in fixed-do the musician uses knowledge of the changing tonality to understand for example that the pitch class c-natural is the supertonic in B-Flat major or minor, and the dominant when the music modulates to F-major, but the c-note remains the same pitch.