After a 9 week wait for a back order, I finally got to listen to Borodin String Quartets Nos. 1 and 2 {Musical Heritage Society}. It was well worth the wait. Beautiful music with exceptional audio qualities. If you are exploring this genre for the first time as I have been doing, really for just the last few years, then you can't go wrong with a JohnK recommendation.
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With great power comes Awesome irresponsibility.