Don, certainly essential are the Debussy and Ravel String Quartets and here's a fine performance which also includes Ravel's exquisite Introduction and Allegro. The beautiful Borodin Quartet should also be basic. Then, of course, the Dvorak American Quartet is justly popular. More Dvorak, not as well known, but very attractive is this . Very little known, but worth learning, are these Bax compositions.

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Enjoy the music, not the equipment.