Compared to sacred choral music of the great Spanish composers of the Renaissance, church music of later Spanish composers is relatively ignored, despite the fact that many left behind a significant body of works worthy of scholarly investigation and performance. In fact, there is a paucity of information on eighteenth-century church music in Spain - music history books generally treat the subject in the briefest way. To correct this situation, scholars must delve into the large caches of unpublished works from this period, which lie dormant in the archives of religious institutions. Even contextualizing these works is difficult, because so much remains to be unearthed. To help fill the lacuna of knowledge about this repertoire, I will shed light on the music of maestro de capilla José Gil Pérez (1715-1762), who was active at the cathedral of Segorbe, Spain from 1745 until his death in 1762, by presenting an edition of one of his vespers services. This service is comprised of a magnificat and three psalms (nos. 116, 122, and 147). These works, transcribed from the composer's autograph housed in the Segorbe cathedral, and written for SAT/SATB chorus and organ, will serve as a valuable contribution to the body of knowledge concerning choral music of the Spanish late Baroque. It will be seen that despite Gil Pérez's innovative use of "theatrical" instruments in the Segorbe cathedral and "Italianisms" in his villancicos, his compositional style in Latin works was largely conservative, in keeping with the practice of most maestros in Spain at this time. In fact his oeuvre demonstrates varying influences, largely dependent upon the genre. To contextualize this composer and his works, I will provide background information regarding music in the Segorbe cathedral during the century in question, including trends and influences, as well as information on Gil Pérez himself.