Luke and Riff get ready for their tour across the country on the upcoming episode 13, titled "If I Could Do It All Again," of the fourth season of the musical drama series "Nashville."

The official synopsis from The Futon Critic reveals that Riff and Luke are ecstatic with the preparation for their upcoming tour. However, while the planning progresses, Luke suddenly feels that his decision to be on tour with Riff (played by Tony Award-winning actor/musician Steve Kazee) was made too fast. Deacon and Frankie, on the other hand, are fighting about Vita. Frankie decides on something that could change — or worse, damage — everything.

The promo trailer for "If I Could Do It All Again" shows Layla admitting that working with Avery is her favorite thing to do and adds that she loves him. The two country singers are seen making music together. Meanwhile, Scarlett asks Gunner if he is really okay with her song being a single. The clip ends with someone involved in a car accident.

In other related news, TV Line reports that "Nashville" has recently been given new executive producers. "My So-Called Life" duo Marshall Herskovitz and Ed Zwick will be replacing current showrunner Dee Johnson. Johnson is expected to end his term at the finale of season 4. Although it has not yet been confirmed by ABC, it is possible that the TV veteran duo will take on their new roles in show in the most likely fifth season.

Meanwhile, here is the rundown of the previous episode, titled "How Does It Feel To Be Free."

Everything seemed to be falling in its right place in Layla's life. Rayna expressed her interest for the start of Layla's second album as long as she finishes with her first album and a tour. Layla even chose her producer — Avery.

"Nashville" season 4 airs every Wednesday at 10 p.m. on ABC.