Here is a rare radio broadcast from 1939 of the “Sonata sopr'il Soggetto Reale“ from Bach's Musikalisches Opfer, BWV 1079 with Jan Sevenstern, flute; Nicholas Roth, violin; Carel van Leeuwen Boomkamp, violoncello piccolo; and Anthon van der Horst, harpsichord. Link to my Anthon van der Horst playlist:
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