It might be hard to tell from the grainy video shot at Fairfax’s Sleeping Lady last September, but yes, the man who spontaneously joined Danny Click and the Hell Yeahs for two songs was none other than Carlos Santana. Cindy Blackman, the jazz drummer who backed up Lenny Kravitz and happens to be married to Santana, joined the Texas-blues juggernaut on drums. Halfway through the video, they all tear into a blistering blues jam, blasting straight to the outer limits and taking the audience on a ride on the blue space wave to the fourth dimension of rock. Thank you, O Swami Santana, lord of all things electric and stringed, and thank you, Danny Click and the Hell Yeahs, for kicking out the jams on Friday, April 6, at the Hopmonk Tavern. 230 Petaluma Ave., Sebastopol. 8pm. $12. 707.829.7300.