txtCommentary1=Since the sound of the {\uldb cello}{\v 76489} is heavier, two {\uldb violins}{\v 105626} are needed to provide balance. {\uldb (Orchestras}{\v 134419} preserve a similar ratio.) Two like {\uldb treble}{\v 101941} instruments offer the composer opportunities for sharing material that {\uldb instruments}{\v 84565} of different {\uldb range}{\v 93231} would not. Finally, the {\uldb interval}{\v 84848} relationship from the cello to the {\uldb viola}{\v 105422} an {\uldb octave}{\v 90046} above, and from the viola to the violin a {\uldb fifth}{\v 91593} above, follows the
txtChapterHead=A Rationale
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txtCommentary2=\par\par {\uldb overtone series}{\v 117826} exactly (octave, then perfect fifth). \par\par While we can imagine many other viable {\uldb chamber-music}{\v 76679} combinations, the {\uldb string quartet}{\v 154839} offers a blend, balance, and individual expressiveness that continue to appeal to composers and performers more than two centuries after its\par creation.{\fs24\uldb \'80}{\v next}
