When you're raising money for ALS, it seems like everybody wins with this Ice Bucket Challenge.

Even CMT Hot 20 Countdown host Katie Cook accepted the challenge from singer-songwriter Gwen Sebastian and then nominated Dolly Parton.

But if I had to pick a couple of country winners, I'd say Eric Church, Carrie Underwood and the Zac Brown Band probably did it best.

"I'm certainly not scared of a cold one," Church said, referencing his new single, before an entire John Deere tractor loader filled with ice was casually dumped onto his head.

Underwood and her husband Mike Fisher used a very full loader, too. The Zac Brown Band opted for a fire truck and three construction loaders to douse themselves.

Not that a plain old ice bucket or cooler or trash can full of ice and cold water is any less impressive, but I just think extra points should be given to anyone enduring that sort of quantity.

The Challenge started in late July as an attempt to raise awareness for Lou Gehrig's Disease (Amyotrophic Lateral Sclerosis).

The idea of the Challenge is to take the bucket to the head or make a donation to fight ALS within 24 hours. Obviously, with so many celebrities getting involved, they are probably doing both.

Since July 29, the ALS Association has had $4 million in donations (compared to $1.12 million during the same time period last year) and welcomed about 70,000 new donors.

"We have never seen anything like this in the history of the disease," said Barbara Newhouse, President and CEO of the ALS Association. "We couldn't be more thrilled with the level of compassion, generosity and sense of humor that people are exhibiting as they take part in this impactful viral initiative."

So far, here are some of the country stars who are getting involved, getting wet and challenging their fellow stars. It's quite a viral chain of events.

Taylor Swift was challenged by Ingrid Michaelson and Lily Aldridge, and she then nominated Selena Gomez, Emma Stone and Ed Sheeran.

Keith Urban was nominated for what he calls the "ice bucket dousing" by Dustin Lynch, and then he challenged Tim McGraw, Church and John Mayer.

Tim McGraw did it with what looks like his daughters doing the dousing and wife Faith Hill doing the filming. Then he nominated Tyler Perry, Garrett Hedlund and Chris Martin.

Church said he was going to "swing for the fences" in nominating George Strait, Bruce Springsteen and Metallica's James Hetfield.

Underwood and Fisher nominated Jennifer Nettles, Trevor McNevan and Shea Weber.

Nettles did it with tourmate and good sport Brandy Clark by her side.

Cassadee Pope does the honors for Kip Moore, who then nominated Miranda Lambert.

Miranda Lambert and Thomas Rhett did it side-by-side after having been nominated by Justin Moore and Kip Moore. Then they told Ashley Monroe, Dierks Bentley and Rhett Akins it was their turn.

When Monroe did it, she nominated her husband John Danks, Jordan Danks and her Pistol Annies pal Angaleena Presley.

Presley did it, then nominated Sheryl Crow, Will Hoge and Blu Sanders.

Blake Shelton, nominated by Hoda Kotb, did it with Carson Daly, then nominated Gwen Stefani, Pharrell Williams and Adam Levine.

Chase Rice nominated Dierks Bentley, who did the whole filling and dumping of the bucket by himself outside his tour bus after which he nominated Kip Moore and the Cadillac Three.

Shelton helped Stefani by being the one to cover her with ice water, telling her how refreshing it would be. Then tortured her with the slowest pour ever while she nominated her husband Gavin Rossdale, Nicole Richie and Jessica Alba.

On Sunday's (Aug. 17) episode of ABC's Rising Star, Brad Paisley and Ludacris dumped the ice water on Josh Groban. The sequence on that one is that Kenny Loggins nominated Paisley, who nominated William Shatner. Groban was then nominated by Shatner.

In addition to the others on the list, I think Lady Antebellum should also get credit for the creativity of Charles Kelley's nomination. He challenged supermodel Kate Upton, who appears in the band's "Bartender" video.

"World, you're welcome," Kelley says. Because who wouldn't want to see Upton get all wet?