It’s the night before Halloween, and who better to usher in the bewitching new season than Alice Cooper, especially in a magnificent Art Deco landmark on Hollywood Boulevard? The former Vincent Furnier has had a lot of ups and downs in his lengthy career since his heyday in the 1970s, but, as with the undead, you can never really count him out. In fact, the Coop seems to be on a bit of an upswing lately. Last year, he formed Hollywood Vampires with Joe Perry and Johnny Depp, and his ancient ditty “Elected” has become a sarcastically appropriate anthem for the all-too-scary upcoming presidential election. Cooper has toured with erratic backing musicians over the years, but his current lineup, featuring guitarists Ryan Roxie, Nita Strauss and Tommy Henriksen, is reliably powerful.