"It was like a bolt out of the blue."
Mr Barker said he'd been looking at taking the band to America, but the email had opened the way and sped the process along. He admitted when he first got the email, he wondered whether it had been a prank.
"It was a really fortuitous hook up."
During their month there they'll play a range of gigs and blues clubs and festivals as well as being a feature artist for the Baton Rouge Blues Festival, and spending time as VIP guests at the New Orleans Jazz Festival.
They'll also be working with the Tipitina's Foundation, which is aimed at protecting and preserving Louisiana's rich musical culture.
Mr Barker said it was pretty cool that they were considered talented and different enough to be invited over.
"It's a little bit like a kapa haka group from New Orleans being invited over here.
"The way we play blues is different and it's obviously different enough for them to be interested in what we're all about.
"The main thing for us is to learn as much as possible from the wonderful artists there."
They also planned to record a couple of songs at a studio there with the New Orleans Brass Band.
As part of their work with the Tipitina's Foundation they would be going into schools and running workshops.
Mr Barker said he hoped to build a network of contacts that would allow them to tour the Southern states of the US each April.
• Tickets for the Swamp Thing concert at Okere Falls Store are $20 and are available from the store, the Library Cafe, or online at www.eventfinder.co.nz. If it doesn't sell out, there will be door sales on the night for $25. The gig starts at 7pm.