LibraryMusicSource.com is a new database for Stanford users, which is provided by the Stanford University Libraries. It is described as "The largest collection of Western Classical sheet music ever assembled." LibraryMusicSource is based on the cd-rom products CD Sheet Music, and Orchestra Musician's Library, which may be familiar to you.
Since it is subscription based and limited to Stanford users, you will need to either be on the Stanford computer network or have proxy access from off campus.
The database includes solo repertoire for many instruments & voice, some chamber music, some full orchestral scores as well as orchestral parts, choral music and opera vocal scores. You will probably find that some instruments are covered more thoroughly than others. For instance, there is a lot of solo piano music and vocal music but less solo wind music.
See also Music Databases: What's New in this issue.
