Here are entered musical compositions not in a specific form or of a specific type for 2 violins, viola and cello and collections of compositions not in a specific form or of a specific type for various combinations of four bowed stringed instruments. Compositions not in a specific form or of a specific type for combinations of four specific stringed instruments other than 2 violins, viola and cello are entered under this heading followed by the instruments in score order.Works about the string quartet as a musical form are entered under String quartet. Works about ensembles that perform string quartets are entered under String quartets (Musical groups). --headings for forms and types of music that include "string quartet" and headings with medium of performance that include "string quartet"