In fact they make quite a lot of different varieties of wine.
And at a tasting event last week I got to try some.
"We’re a San Francisco band so we started thinking about ‘we need to create a culture for people to grasp onto the band' and in America and there’s one place to make good wine – and that’s northern California."
So far around two and a half million bottles of the band's wine have been sold, raising considerable amounts of money for the charity.
Along with Monahan, Train's lead guitarist Jimmy Stafford takes a keen interest in the wine, created with San Francisco wine company.
Here he is talking about how the wine is made.
Monahan revealed the band is due to release a sixth variety next month.
Not content with selling millions of bottles of wine to raise money for a worthy cause, the band also makes its own chocolate...
Rock music and wine. Who would have thought?
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