Børge Roger Henrichsen's Tonarium for Double Bass And Piano. Edited by Thomas Clausen and Jesper Lundgaard.

A TONARY (Lat. tonarium) is defined as a liturgical book
of the Western Christian Church containing various chants which
is organized according to the eight psalm tones of Gregorian
chant.

With that in mind and in the spirit of J.S. Bach’s ‘Das
Wohltemperierte Klavier’ and his penchant fo...