Mickey Hart and Planet Drum, “In the Groove.” The weird thing about getting a bunch of legendary percussionists from around the world together to make a record: It may only appeal to hardcore drum nuts, or that rare slice of society that loves throbbing world beat as background noise.…

Dead & Company perform at Chase Center in San Francisco on Dec. 30, 2019. Photos: Gary Chancer. SAN FRANCISCO — Dead & Company’s Dec. 30 show at Chase Center was both a Grateful Dead concert and, at the same time, not a Grateful Dead concert. Dead & Company 8…