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EarSketch is an online learning environment that uses the Web Audio API to teach computer science and computational thinking through music technology, production, and remixing. It is designed to broaden participation in computer science and music education for beginning learners by providing a free, web-based application coupled with curricula for informal and formal learning contexts and a library of audio content spanning multiple popular genres. This paper describes an analysis of EarSketch’s accommodations for students who are blind or visually impaired (BVI) and initial improvements to the system to improve accessibility. This paper also presents the findings of a user study designed to determine the biggest accessibility issues for EarSketch users who are BVI, and a discussion of how accessibility improvements can help broaden participation in computing and music education and, more broadly, how all web audio application developers can integrate accessibility considerations into their work.