Country in 2015 bent, blurred, ignored and imploded Music City's lines — and occasionally its bottom line too. Luke Bryan, the industry's biggest star, tinkered with disco strings and hip-hop noise. Superstars like Carrie Underwood and Tyler Farr leaned into R&B, while outsiders like Kid Rock and Don Henley made rootsy down-home statements. Blackberry Smoke made great Southern rock, Old Dominion's made great pop-rock and Eric Church name-checked indie-rock — but Chris Stapleton and Jason Isbell did a lot of the heavy lifting to actually bridge the gap with rock listeners. Here are the 40 best country albums of the year.