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The former "Friday Night Lights" star tells New York magazine, "It's been hard. I've been working with T Bone Burnett for months. I'm the remedial student in our cast of singers -- everyone else has great voices, and I'm the one who only did it back in drama school.
"We'll spend days just sitting around and listening to the music Rayna would have grown up with. I started singing this Bonnie Raitt song with my vocal coach the other day, and I literally burst into tears because I'll never sound as good as Bonnie Raitt."
The show also stars Hayden Panettiere as Juliette Barnes, a young country vixen who clashes with Connie's character. "Nashville" premieres Oct. 10 on ABC. It's not the only new fall show with a country music theme to it. "Malibu Country," starring Reba McEntire as a singer who relocates from Music City to California, is set to premiere in November.