Designed to be introductory primers for high school or other beginning groups, the Contemporary A Cappella Association Songbooks nonetheless adhere to a fine musical standard (unlike some beginning arrangements, which can be watered down and unsatisfying). There are informative performance notes and recommendations for transposing parts, to permit performance by all male or female ensembles. In addition, a discography suggests definitive recordings of these popular songs, which can help facilitate the learning process and educate the ear. Easy to use, the CASA songbooks are an excellent resource.