From Vanguard:

While Saliers’ and Ray’s mood may have been reflective, the atmosphere in the studio was urgent and lively. The duo barreled through the recording process in three weeks flat in Atlanta with longtime bassist Clare Kenny, session-pro drummer Matt Chamberlain, engineer David Boucher, and veteran producer, arranger, and keyboardist Mitchell Froom, all of whom worked on Despite Our Differences. “There wasn't time for lot of belaboring over decision-making so it was very much an in-the-moment recording, which I found exhilarating,” Saliers says. As a result, a certain intimacy and vulnerability crept in, Ray says, “because there was no time to second-guess ourselves and make everything super correct. We had to trust our instincts.”

One thing the Girls have done differently on Poseidon is include a second CD that features acoustic versions of all the songs, plus a bonus track, “Salty South.” “The release of the acoustic record will give folks a taste of how the arrangements change with the addition of the band,” Ray says. “I think our fans will really appreciate it,” Saliers adds. “Amy and I always talk about whether our fans want to see us with the band or whether they want to see us perform acoustically. Many times we settle on doing it acoustically, so this is a way for them to musically experience the more intimate setting. It was just Amy and I sitting around with a bunch of microphones and playing in a very stripped-down and organic way.”