I’m David L. Coddon, and here’s your guide to all things essential in San Diego’s arts and culture this week. Two timeless songs performed by Chester Gregory during his “Higher & Higher: A Rock ‘n’ Soul Shindig” concert stirred me to the core, because when the virtual show was over, I turned to Alexa and asked her to play “A Change is Gonna Come” by Sam Cooke, and after that “What’s Going On” by Marvin Gaye. I just had to hear them again, in their original incarnations. Not that Gregory, a Broadway performer with “Hairspray” and “Sister Act” and “Motown: ...