Joey Burns of Calexico
played keyboards on "Curse of the I-5 Corridor." He told Uncut
. "I felt like the piano parts on here give a sense of earth. To be sure, she's a full-on environmentalist and naturalist, so I tried to let the piano parts offer some aspect of her character. We all just throw a lot of ideas at her, but you never know what she'll end up using. She's not just thinking about traditional music or traditional means of recording. She's looking to create unusual sounds."