This is a gem of a CD. It's a well-chosen, well-performed and well-presented anthology of mid-Baroque German sacred cantatas. Bass Peter Kooij and the seven-person L'Armonia Sonora are directed by gambist Mieneke Van der Velden. They have a close and warm affinity not only with one another, but also for the music; it's music as varied as it's beautiful. Its rich, sustained sonorities will stay with you long after you have finished the uplifting experience of listening to the CD. Released on the enterprising Ramée label De profundis clamavi comprises seven sumptuous examples of the music written in the north German Länder in the period after the Thirty Years War. It's music which not so much 'reflects' that profound conflict, as is 'affected' by it – weighed down with detached regret and unselfconscious resignation.

Like many of his German and Austrian contemporaries, Bohemian-born composer Heinrich von Biber was strongly influenced by the Italian school of violin composition that included Biagio Marini (1587-1665) and Marco Uccellini (1603-1680). A noted virtuoso himself, Biber and his teacher Johann Heinrich Schmelzer (1621-1680) were two of the most important figures of the late seventeenth-century Viennese violin style. Biber's keen understanding of the technical and expressive possibilities of the instrument is evident in his innovative use of pizzicato (plucking of the string with the finger), double and triple stops (more than one note played at once creating "chords"), col legno (stick of the bow on the string), sul ponticello (played close to the bridge), and, especially, scordatura (intentional "mistuning" of the strings). Scordatura allowed the performer to play chords in particular keys more easily, extended the range of notes, and provided more open strings in order to negotiate the difficulty of polyphonic writing for a single instrument. Biber's imaginative and original use of these techniques or special effects brought violin virtuosity to an entirely new level of musical expression in the Baroque period. It can be argued that J. S. Bach's masterful Sonatas and Partitas for Solo Violin, written in 1720, are direct descendants of Biber's grounding breaking Mystery or Rosary Sonatas, composed nearly a quarter of a century earlier.