When guitarist Carlos Santana played Blossom back in 2019, he showed he hadn’t lost a step. Playing guitar so vigorously that you could see the beads of sweat on his forehead, Santana, who wore his signature fedora and a black T-shirt with a giant white dove on it, demonstrated just how captivating a great guitarist could be. While he had two singers with him in his terrific band, the spotlight mostly shone on him, a real anomaly in today’s pop/rock world where the singer is almost always the star. The classic rocker performs tonight at 8 at MGM Northfield Park — Center Stage.