While the largest collection of books on music is at Columbia's Music & Arts Library, Barnard and Butler both have collections of music books. In the Library of Congress Classification system the majority of music books and sheet music fall within three areas:
CLIO is the online catalog to Columbia University Libraries (including Barnard), but excluding Teacher's College and the Law Library who maintain their own catalogs. CLIO contains over 7 million records for books, online resources, journals & newspapers, conference proceedings, sound recordings & scores, videos, archival collections & oral history transcripts, online databases, maps & images, and more!
What is CLIO? from IMATS @ Barnard on Vimeo.
While many sound recordings and videos are available online, the majority of classical, jazz, folk, pre-21st century popular music, and video recordings are still only available in hard-copy, most often due to licensing and rights issues. In addition, streaming quality is often lower-quality more compressed. You can find CDs, LPs (records), VHS and DVDs in CLIO.
It's not always obvious what format a recording is in. The collection contains some LPs, LaserDisc, and VHS. LPs will include in their description the phrase "analog, 33 1/3 rpm" while CDs will be listed as being 4 3/4 in. The call numbers for recordings will also normally include their format. See screenshots below for examples.
Sound recordings can come in four formats in CLIO:


Barnard Library has portable CD/DVD drives that can be checked out at the circulation desk for four hours at a time. The drives work on both Macs and Windows, and connect via an attached USB cable. No software is required to use them! They can be used with a personal computer or a library lab computer.
The Barnard Library has four media viewing stations on the south side of the Milstein Center second floor (see floorplan) - these are able to play both VHS and DVDs.
Viewing stations are located in Butler 401 (the Periodicals & Microform Reading Room) and support the playback of multiple visual and audio formats. Equipment includes multi-standard VCRs, multi-standard and multi-code DVD players, audiocassette players, and a laserdisc/DVD/CD player. Two viewing stations are equipped with Blu-ray players.
Priority is given to patrons viewing course-related films.