"The Music Masters Vols. 2 and 4 edited by A.L. Bacharach Pelican Books" are non-fiction books focused on the subject of music. Edited by A.L. Bacharach, these volumes likely explore various aspects of music history, theory, or prominent musicians. As part of the Pelican Books series, known for their educational and informative content, these volumes are likely to provide valuable insights and knowledge for music enthusiasts or scholars interested in the topic.