Closers often resemble musical fads. They seem invincible for a spell, then suddenly fall out of favor, for any number of reasons — from injury to age to one pitch that steals the mental toughness necessary to be effective.

In other words, closers are like the Spice Girls of the baseball diamond. A few years back, they were all popular — even Baby Spice. Now, we only remember Posh and maybe Ginger. The rest, well they disappeared quicker than Mark Wohlers’ ball control. Eric Gagne, Rangers — MLB’s Posh Spice. His name still carries some weight, even if he hasn’t done anything productive in a while. He came off the DL this week and supplants Akinori Otsuka as the stopper. Roto Files says Gagne has seen the last of his world domination. Expect more injury trouble and/or poor production, and ultimately Otsuka returns as the bullpen anchor.

Brad Lidge, Astros — Ginger Spice. He was the heir apparent to Mariano Rivera as the game’s best closer until Albert Pujols came along in Game 5 of the 2005 NLCS. Lidge has never been the same. He lost his closing gig last week in favor of Dan Wheeler. Lidge is not worthy of a roster spot. If you snagged Wheeler, he should be a solid replacement.

Salomon Torres, Pirates — A lot of people don’t know he exists, he’s only marginally talented, and he won’t be missed when he loses his job. In other words, he’s Baby Spice. He blew a save then took a loss in back-to-back games last week. Matt Capps stands ready to assume the role if Torre continues to falter.

Todd Jones, Tigers — Let’s call him Sporty Spice. He’s underrated and people keep dismissing him. But until Jones shows signs of decline, Joel Zumaya will stay in the set-up role. At this point, carry Zumaya in deep keeper leagues only.

Bob Wickman, Braves — It’s always an adventure with the Wick on the hill, so let’s call him Scary Spice. With Mike Gonzalez now sharing a seat in the pen, be ready to pounce if the aging Wickman struggles or forgets to take his Geritol.

dloftis@nypost.com