This week on Nashville Star, our contestants proved their mettle and stepped the competition up a notch by performing their original songs.Brandi Gibson:"I'm Gonna Make It" - originalBuddy Jewell:"Help Pour Out the Rain (Lacey's Song)" - originalMiranda Lambert:"Greyhound Bound for Nowhere" - originalBrandon Silveira:"Life Don't Get Much Better Than This" - originalJohn Arthur Martinez:"Everything I Never Knew I Wanted" - originalAmy Chappell:"No Turning Back" - original