Isabelle Demers at the Spreckels Organ Pavilion, Balboa Park, August 12, 2019
by Mark Gabrish Conlan • Copyright © 2019 by Mark Gabrish Conlan • All rights reserved Last night’s organ concert at Balboa Park featured Isabelle Demers, a French-Canadian performer who now lives in the U.S. and teaches at Baylor University in Texas. Demers has been here several times before — the first time she was selling her CD The Old and the New , though last night she didn’t have a merch table — and though her performance may not have been quite as overwhelming as Thomas Ospital’s the week before, it was a wide-ranging concert that offered a lot of colors and unusual organ sounds. She began with one of a number of virtual collaborations between two Baroque masters, Antonio Vivaldi (1678-1741) and Johann Sebastian Bach (1685-1750): Bach’s adaptation for organ solo of a Vivaldi concerto for two violins and orchestra, RV 522, which in Bach’s version bears the identifying number BWV 593. (The initials stand for “Bach Werke Verlag,” the last word simply being the German for “publis...