Don, this is the Stravinsky collection that I suggested.

Yes, I've enjoyed Carmignola's recording of the Vivaldi Four Seasons. As far as these being five Vivaldi concertos that have "never before been recorded", it reminds me of the composer who remarked a bit sarcastically that Vivaldi didn't write 500 concertos, but rather wrote one concerto 500 times!

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Enjoy the music, not the equipment.