The concerto, written in 1753 by Johan Sebastian Bach’s fifth child and second son, Carl Philipp Emanuel Bach (1714-1788), sits astride the transition between the Baroque and Classical eras. “Something you’d expect from a Bach concerto is there, but the drama of it is much more than what one would expect,” said Helm, who will perform the concerto as the final composition of the orchestra’s “All in the Family” program March 11-14 (streaming March 18-23). The concert also includes W.F. Bach’s Sinfonia in F Major (Dissonances) and J.S. Bach’s Concerto for Two Violins in D minor (Double).