Drake Applications sort Liber Pro v3.3

iPhone, iPad / Educatifs / Partitions et Tablatures: Liber Pro takes the 1961 Liber Usualis, a book of over 2,300 pages of Gregorian Chant for use throughout the liturgical year, and literally puts it at your fingertips on your iPhone, iPad, or iPod Touch. Liber Pro adds to this tome a linked...