Subject headings allow you to search and browse through different genres and types of music. Here's a list of some subject headings in WorldCat that you might find helpful:
Instrument -- Instruction and study
Instrument -- Methods
Instrument -- Studies and exercises
Instrument -- Bibliography
To start searching just replace the subject headings above with your instrument of choice (remeber to use violincello and double bass). Use "Brass instruments" in place of a specific instrument for general brass instrument materials.