Academic music libraries in the US collect resources to support music students and faculty in their performance and research needs. These resources include non-text items such as musical scores and recordings that are difficult to represent in standard library information systems that were built for text items. The advent of web scale discovery tools that combine libraries' entire physical and digital holdings into a central index has further complicated resource discoverability for music libraries and their patrons. While music librarians have shared the challenges that they face describing and organizing musical resources, it is not clear what strategies music students employ to search for musical resources using web scale discovery tools or the challenges that they face. To explore these issues, usability testing was conducted using the FSU Allen Music Library discovery system. Undergraduate music majors were tasked with searching for musical resources including scores, recordings, and music literature using the discovery layer. Behavioral and attitudinal data captured students' music information seeking behavior and the challenges that they experienced navigating discovery layers. Participants demonstrated an impressive ability to navigate the discovery interface and leverage domain knowledge to aid their searches. Simultaneously, they demonstrated a hastiness in examining bibliographic records that significantly impaired their ability to successfully locate musical resources, particularly music literature. Finally, aspects of the user interface including main access points, facet settings, and brief record displays served as barriers to music information seeking. These findings are used to suggest strategies that music librarians can adopt to optimize their discovery layers and adjust library instruction to better support their patrons' music information seeking. [The dissertation citations contained here are published with the permission of ProQuest LLC. Further reproduction is prohibited without permission. Copies of dissertations may be obtained by Telephone (800) 1-800-521-0600. Web page: http://www.proquest.com/en-US/products/dissertations/individuals.shtml.]