Strings and Guitar

M310 - M386 Trios (which may include on or more string instruments)

M310 - M314 Two strings and piano

M349 - M353 String trios

M410 - M486 Quartets (which may include on or mor string instruments)

M450 - M454 String quartets

M460 - M464 Quartets for strings and winds

M510 - M514 Four strings and piano

M550 - M554 String quintets

M60 - M654 String sextets

M750 - M754 String septets

M850 - M854 String octets

M950 - M954 String nonets

For other combinations (sextets, septets, etc.) follow the same pattern as above
Also try the subject heading String Ensembles

For string ensembles with other instruments (piano, flute, etc.), after each basic subject heading (trios, quartets, quintets, etc.) the instruments are organized in the following order: Keyboard (piano, continuo, etc.), winds / brass, percussion, strings (in score order).

So, for example, if you are searching for trios for clarinet, horn and piano use the subject heading trios piano horn violin

• Use quotation marks around phrases. "French Horn"

• Truncate using * This is an excellent way to improve your search results. For example, Sona* will find Sonata, Sonatas, Sonatina, Sonatinas etc.. Truncating means you don't have to search for these words separately by typing each one individually.

• Use "AND" and "OR" to combine words or phrases. These are known as Boolean operators.

• Use parentheses: ( ), called "nesting, to groups terms together so you can combine even more concepts or Synonyms. For example: (cello OR violincello) or (beliefs OR attitudes). Using both terms ensures you will get relevant results.

Music Reference