As a songwriter and a singer, Cole Swindell is one of the linchpins of the breezy country-pop sound that became known as bro-country. He first came to prominence as a songwriter for Luke Bryan, a fellow alumnus of Georgia Southern University, but around the time Bryan took "Roller Coaster" to number one, Swindell began his own climb up the charts. He racked up several big hits in the middle of the 2000s -- "Chillin' It," "Hope You Get Lonely Tonight," "Ain't Worth the Whiskey," "You Should Be Here" -- that became emblematic of the sound of mainstream country of its era: friend...