This collection of scores is based on The Resounding Project's first album, Music of the High Medieval Era Performed on Period Instruments. The Resounding Project researches and reconstructs early musical instruments and uses them to recreate authentic early music. The work uses the period instruments of the 11th-13th Centuries to perform fifteen songs from that time. Scores in this book are illustrated with sketches of these unique instruments. The songs sample five regions of Medieval Europe and include pieces by Alfonso X, Aquinas, Codax, Machaut, and others. These tunes were chosen as examples of medieval music in general. Although we do not know every detail about the music of this period, the songs represent an aggregation of the most reliable sources available. Accompaniments and chord symbols have been created for most tunes, with consideration of the likely instrumentation and styles of the time. The songs are well-suited for solos or ensembles in a variety of instrumentations.