April 28, 8pm. $15. The Cultural Center of Cape Cod, 307 Old Main St., South Yarmouth. 508-394-7100. www.cultural-center.org. When The George Gritzbach Band hits the stage, the air sizzles with excitement. Up front: Gritzbachs smoky vocals, steamy harmonica, and shimmering guitar. Backing him up: Michael Critch works his keyboard into waves of R&B emotion, Rich Hill pumps the hottest bass lines this side of Willie Dixon, and groove master / drummer Bobby Alves drives the heart of the band. In demand as a high-energy R&B dance band strongly rooted in the blues, funk, and New Orleans, The George Grtizbach Band plays inventive takes on classics and a healthy helping of innovative originals. The band has opened for B.B. King, Eddie Money, and other greats. For a sample of their music, visit www.georgegritzbachband.com. Call for reservations.