Heinrich Biber’s astonishingly powerful and deeply emotional Mystery Sonatas represent a triumph of Baroque invention. Boston Baroque’s Christina Day Martinson delivers a technical tour de force, as she navigates the virtuosic challenges presented by the fiendishly demanding changing scordatura. Boston Classical Review described her live performance as ‘a flourish of technical complexity and musical wizardry’, whilst the Boston Globe wrote, “Day Martinson…didn't just survive, she triumphed.” The adventurous use of six baroque violins in fifteen different tunings creates otherworldly soundscapes that result in a deeply moving and glorious listening experience. This highly disorientating practice reaches its pinnacle in Sonata XI ('The Resurrection') where the middle two strings are crossed over each other both in the peg box and behind the bridge, so that one can literally see a cross on the violin. The fifteen sonatas have been traditionally grouped into three sets of five: five joyful mysteries, five sorrowful mysteries, and five glorious mysteries. Boston Baroque’s founder Martin Pearlman plays organ and harpsichord, with Michael Leopold on theorbo and guitar and Michael Unterman on cello.

This album allows us to appreciate the versatility of the young performer Anna Urpina, whose goal has been to approach each score from a historically informed perspective. The compositions of c. XVII and XVIII (Castello, Biber, Corelli and Telemann) are recorded with Baroque violin (with gut strings) and bow next to the harpsichord. In addition, the tuning is half a tone lower (415 Hz) than is usually used in the current repertoire (442 Hz). Period techniques have also been put into practice, as well as Baroque flexibility in ornamentation and improvisation. Summoning a single key instrument to give life to the basso continuo allows us to compare in a more direct way the works belonging to the two historical periods, since the scores of c. XX and XXI (Webern, Pärt, José Luis Turina and Guix) are performed with modern violin and piano. In fact, following this idea of highlighting to the maximum the contrasts and constants that relate the eight compositions, the pieces have been ordered by combining one of each period instead of following a chronological order, thus generating quite a stimulating hybrid narration. An original proposal which highlights the sophisticated sound and artistic potential of the “four-chord lyre”, as Biber used to call the violin.