J.S. Bach: ‘Air on the G string’ on double flute / double recorder by Hein Zegers. Using two alto recorders modeled after Joannes Hyacinth Rottenburgh (1672-1765) as echo flutes. Played in Autobahnkirche Medenbach, where long-distance travelers come and go, day and night, and could do so at any time during this performance.