It is presumed that the Mystery Sonatas were completed around 1676, but they were unknown until their publication in 1905. The music of Biber was never entirely forgotten due to the high technical skill required to play many of his works; this is especially true of his works for violin. Once rediscovered, the Mystery Sonatas became Biber’s most widely known composition. The work is prized for its virtuosic vocal style, scordatura tunings and its programmatic structure.
Xavier Diaz-Latorre plays the Passagaglia on a 13 course Lute (Youtube)