See also Orchestral Recordings, Recordings, Performances
Classical Connect "is your virtual concert hall. It offers independent classical musicians the opportunity to be heard around the world while providing music lovers with a large selection of music performed by some of the most interesting musicians around." Musicians can sign up and upload performances to "share your music with the rest of the world." Features: browse by instrument, ensemble, composer, set up playlists.
Pandora - Radio from the Music Genome Project
Very slick - you can build your own "internet radio station" that plays (through the computer) any kind of music you like, any era, style, artist, song - it will build a never-ending queue of tunes to be played. You can build many "stations" of different styles, and you can have a station that is a mix of any or all your stations. There's also Postclassic Radio - "weirdly new music from composers who've left the classical world far behind."
Classic Cat - Classical music "directory with links to over 4800 free-to-download classical performances... sorted by composer and work." Information on composers, performers, instruments, genres, "Top 100", info, links.
Themefinder - find musical themes and incipits by giving several notes.
Classical Music Online and Beyond- accessing online classical music radio stations and satellite radio
Music Online - Alexander Street Press again. Massive collection of classical music recordings. Available through [music] library subscriptions.