“Purple Species and Friends,” by Joe Satriani. Guitarist Joe Satriani, whose interest in science fiction is reflected in the titles of his instrumental rock albums (Surfing With the Alien, Is There Love in Space?, Shockwave Supernova, etc.), demonstrates an interest in the future, and the world of imagination, in his artwork, too. Check out his “Purple Species and Friends,” above, and his “Alien Party,” to the right. “Alien Party,” by Joe Satriani. March 12 from 5 to 8 p.m., Satriani will make a personal appearance at a show of his works titled “Beyond Reality” that is now running at the Wentw…