Chicago's Bach Week Festival Announces 2021 Virtual Concert Lineup Bach works will include a selection of chorales and chorale preludes for organ, an organ toccata, a harpsichord concerto, and a Brandenburg Concerto.by BWW News Desk Chicago's 2021 Bach Week Festival will arrive as a virtual two-concert series of free-to-view webcasts May 16 and 21 featuring instrumental and vocal music of the festival's namesake, German Baroque composer Johann Sebastian Bach, plus a work by Bach contemporary Georg Philipp Telemann, in prerecorded and livestreamed performances. Bach works will include a selection of chorales and chorale preludes for organ, an organ toccata, a harpsichord concerto, and a Brandenburg Concerto.