Figure 1 Music from the Hearts of Space logo from the cover of the 1981 Hearts guidebook. Calligraphy by William Stewart. ©1980–83 Hearts of Space. Used by permission. More

Figure 2 Stephen Hill and Anna Turner in the studio, 1981. Photograph by Steven Mangold. ©1981 Hearts of Space. Used by permission. More

Figure 3 Poster for a concert series broadcast during Music from the Hearts of Space ’s first month on air in 1973. Artwork by Wes Wilson; calligraphy by Stephen Hill. ©1980–83 Hearts of Space. Used by permission. More

Figure 4 Anna Turner and Stephen Hill, hand-tooled Polaroid, ca. mid-1970s. Photograph credit unknown. ©1980–83 Hearts of Space. Used by permission. More

Figure 5 “Spacemusic” art for Hearts of Space mail order catalogs, ca. 1980. Calligraphy by William Stewart. ©1980–83 Hearts of Space. Used by permission. More

Figure 6 Hearts of Space public radio trade show poster illustrating satellite transmission uplink from San Francisco, ca. mid-1980s. Airbrush artwork by Barbara Falconer. ©1980–83 Hearts of Space. Used by permission. More

Figure 7 Stephen Hill and Anna Turner in the studio, 1981. Photograph by Steven Mangold. ©1981 Hearts of Space. Used by permission. More

Figure 1 The hymn Iam lucis orto sidere with the “Fulget dies” refrain, Florence, Biblioteca Medicea Laurenziana, Pluteo 29.1 ( F ), 470v. Used by permission of MiBACT. More

Figure 2 The hymn Iam lucis orto sidere with the “Fulget dies” refrain, Sens, Bibliothèque municipal 46 ( Sens 46 ), p. 27 (image reproduced via BVMM) More

Example 1 Melodic comparison of Benedicamus Domino song tropes featuring the “Fulget dies” refrain (initial strophes) More

Example 2 Melodic comparison of thirteenth-century hymns featuring the “Fulget dies” refrain More

Example 2 Melodic comparison of thirteenth-century hymns featuring the “Fulget dies” refrain More

Figure 3 Hymns featuring the “Fulget dies” refrain, Worcester, Cathedral Music Library, F.160 ( Wo ), 165v. Photograph by Mr. Christopher Guy, Worcester Cathedral Archaeologist, reproduced by permission of the Chapter of Worcester Cathedral (UK). More

Figure 4 The hymn Iam lucis orto sidere with the “Fulget dies” refrain, Ljubljana, National and University Library, MS 29 ( L ), 70v More

Example 3 Fourteenth- and fifteenth-century “Fulget dies” refrains More

Figure 5 The hymn Wulstane presul with erased “Fulget dies” refrains, Worcester, Cathedral Music Library, F.160 ( Wo ), 165v, detail. Photograph by Mr. Christopher Guy, Worcester Cathedral Archaeologist, reproduced by permission of the Chapter of Worcester Cathedral (UK). More

Example 4 Fit porta Christi pervia with the “Fulget dies” refrain in two early seventeenth-century Catholic songbooks More

Figure 6 The hymn A solis ortus cardine with the “Fulget dies” refrain in Aartsbroederschap van de Heilige Familie (Venlo, 1854) More

Figure 7a Egerton Hours , Prime, historiated “D” of Deus in adiutorium , London, British Library, Egerton MS 1151, 38r More

Figure 7b Egerton Hours , Prime, historiated “D” of Deus in adiutorium , London, British Library, Egerton MS 1151, 88v More