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Guido's groundbreaking work involved composing a piece of music that skillfully combined an existing melody with hymn text. His genius lay in using this combination not just for musical expression but as a pedagogical tool for teaching the notes of the musical scale. Before Guido, music instruction primarily relied on rote memorization. In this method, teachers would sing melodies repeatedly until their students could replicate them, much like how a listener might learn a pop song through sheer repetition, without ever needing to see the sheet music.