Tim Koch directs a group of 70 talented and dedicated singers called the Carolina Master Chorale, based in Myrtle Beach. Their holiday concert, "Christmas & Carols and All That Jazz," will be presented twice this weekend: Saturday at 4 pm at Waccamaw High School Auditorium and Sunday at 4 pm at Trinity Church (between 30 and 31st Avenue North on Business Route 17). Tickets are $15, available at CarolinaMasterChorale.com or 843.444.5774. The concert will feature holiday favorites and new works, all presented in jazz arrangements with a jazz trio.