To make good beer, it helps to know the taste of bad beer.
The Rimrock Brewers Guild put on a class at the Post at the Billings Depot on Saturday.
Tasting bad beer can help the brewers know how the beer tastes if they make mistakes.
The class also included tasting good beer.
And a historian also talked about some of the marketing and slogans of local beers.
"In the history of Billings, 'the beer that made Milwaukee jealous,'" said Steve Lozar, Montana Beer Historian. "And then I'll talk about the beer that was brewed in Siliesia, just down the road here at the Carbon County Brewery and that was 'the beer that made Billings jealous.'"
"It's a ridiculous amount of fun," said Paul Pope of the Rimrock Brewers Guild. "It's a great hobby. It's a lot of fun. and it encourages you to have a beer with friends and share with people. There's a lot of camaraderie and community that has developed here in Montana. We've got a great beer community."