The ERC-funded RESOUND project seeks to revive the long-lost sounds of Hispanic chant, one of the earliest Western musical traditions, whose melodies have remained silent due to indecipherable pre-Gregorian notation. Spanning manuscripts from ca. 700 to 1300, these chants recorded only texts and liturgical ceremonies, lacking precise pitch information. RESOUND will employ a groundbreaking interdisciplinary approach—combining bioinformatics, genetics, computational analysis, virtual restoration, aural architecture, and musical performance—to reconstruct these melodies for the first time. By doing so, the project not only recovers a forgotten soundscape of medieval Europe but also offers new insights into the origins and evolution of plainchant across the continent.