Osborne Enterprises and Jellyroll Productions 
Producer of price guides (in the "Official Price Guide" series) and reference books for music collectibles. General descriptions of each volume.
http://www.jerryosborne.com/All Music Guide
A guide to recordings in every genre. Cross-indexed source of reviews, essays, and ratings; all available online, on in-store kiosks, and in print form. Uses submissions from readers.
http://www.allmusic.com/
Muze
Longtime publisher (over 50 years) of directories of recorded music for retail stores; their data is now available for purchase to place on other websites and in-store kiosks.
http://www.muze.com/
Joel Whitburn's Record Research Books
Information from Billboard magazine's major charts with complete chart data on every recording ever charted. Short descriptions and sample pages from this large line of books.
http://www.recordresearch.com/
RecordResearcher.com
CD-ROM discography RockRom 10, and book Rock Record 7, with 500,000 records, over a million tracks and musicians. Free sofwared demo download.
http://www.recordresearcher.com/
Gramophone Classical Good CD Guide
Brief description of the guidebook to classical music.
http://www.gramophone.co.uk/publications_detail.asp?pub=2
Trouser Press
Official site of Trouser Press magazine (1974-1984) and the Trouser Press Record Guides. Reviews and discographies from five editions of the guidebook.
http://www.trouserpress.com/
Krause Publications
Publisher of several record and CD collecting related books, including price guides.
http://www.krause.com/static/records.htm
Rough Guides
Summaries of over 20 music guidebook titles.
http://roughguides.com/website/reference/music/default.aspx
