Credo reference is a great starting point for beginning your research on topics other than music. Search hundreds of reference dictionaries and encyclopedias for subjects ranging from food science to philosophy.
Daniels' Orchestral Music Online is a unique orchestral music finder tool and an invaluable resource for orchestral librarians, libraries, planners, musicologists, conductors, and artistic directors (from website).
Orchestral Music Online provides:
Access to information on more than 11,600 works by more than 1,700 composers
Quick search by composer, title, or keyword
Advanced search by duration, instrumentation, chorus type, and soloists
Ability to cut and paste data into rehearsal schedules and other documents to save time and to eliminate transcription errors.
Links from individual works to music publishers and other sources
Links to online perusals scores, program notes, recordings etc.
(info from database website)