Not in your list and offered by my library is Music Online. Bold text to highlight the non-audio content. Quoting my library's services page:
Quote:
Streaming music
Music Online - Alexander Street Press
Music Online is a streaming audio, video, reference and scores collection with a fully cross-searchable suite of hundreds of thousands of classical, jazz, American, and world music recordings; scores; and pages of full-text reference content.
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Also they include the following as available to all which may or may not qualify to be added to your list.
Gale Virtual Reference Library
Gale Virtual Reference Library: More than 1,400 reference e-books, plus every Gale information database at Multnomah County Library.
Public Library Complete from ebrary
ebrary: E-books from trusted publishers in all academic subject areas, along with powerful research tools.
Internet Archive
Internet Archive: Offers permanent access for researchers, historians, scholars, people with disabilities, and the general public to historical collections that exist in digital format. Internet Archive includes texts, audio, moving images, and software as well as archived web pages in their collections.
Open Culture
Open Culture: High-quality cultural & educational media for the worldwide lifelong learning community. Audio books, online courses, movies, language lessons, e-books and other enriching content — it’s all here.
Project Gutenberg
Project Gutenberg: The first and largest single collection of free e-books. Most of the over 38,000 titles in the collection are full-text of public domain books. There is also an audiobook collection.
(no links for those that had library-specific URLs.)