On day six, Oprah and Gayle were ahead of schedule and had already crossed the Oklahoma/Kansas border when the song "Oklahoma" started playing on their XM Radio...but that didn't stop them from singing along!
"I love that musical," Oprah says. "I loved knowing that we were in the state of Oklahoma, so I thought I'd join in and sing."
"The singing got on [Oprah's] nerves, but she sang 'Oklahoma' with gusto!" Gayle says.
After Oprah and Gayle's duet, they went solo. Oprah checked out the Oklahoma Welcome Center, while Gayle chatted with fellow travelers in the parking lot. At the welcome center, Oprah found out that Oklahoma has 50 state parks and the largest herd of buffalo!