From Guido of Arezzo’s 11th‑century Ut Queant Laxis hymn to the later shift Ut→Do and the addition of the seventh tone Si, this episode traces how Western solmization took shape. We compare the two main systems in use today—movable do (tonic solfa) and fixed do (do as C)—and explain how each handles sharps and flats, absolute vs. relative pitch, and transposition. Along the way we touch on earlier four‑syllable medieval schemes, cultural echoes in Shakespeare, and how these mnemonic routes help musicians hear music in their head. Sponsored by Ember Silk, AI education and integration at embersilk.com.

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Sponsored by Embersilk LLC