One hundred or so listeners were treated to a surprise club appearance by Garth Brooks Friday night. The Bluebird Cafe, Nashville’s famous songwriting haunt, was hosting a round-robin with Music Row tunesmiths Pat Alger, Tony Arata, Kent Blazy and Kim Williams, all of whom have penned hit songs for Brooks. After a fifth chair and microphone were added to the Bluebird’s in-the-round setting just before showtime, Brooks walked into the club with wife Sandy, his producer Allen Reynolds and labelmate Ty England. Taking his seat in the round, Brooks swapped songs with the four writers, singing “Papa Loved Mama,” “That Summer,” “If Tomorrow Never Comes,” “The Thunder Rolls” and “Much Too Young to Feel This Damn Old” before the night was over. For the final number, Brooks and Arata performed “The Dance.” Brooks discovered the song when he heard Arata perform it at the Bluebird years ago.